你不知道的JavaScript--Item31 值得你挑战的JavaScript面试题(45题)

转载自：http://blog.csdn.net/i10630226

你不知道的JavaScript系列，已经有这么多篇博文了，今天找了一些题目，我觉得，下面这些是你“不可能全部会做 ” 的javascript题目，不信你可以试试，答案在后面的博客给出，也许你是jser大神，欢迎挑战一下！

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1，以下表达式的运行结果是：

<code class="hljs mathematica has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"2"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"3"</span>].map(parseInt)A.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"2"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"3"</span>]B.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>]<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">C</span>.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>]<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">D</span>.其他 </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

2，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">typeof</span> <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">null</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">null</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">instanceof</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Object</span>]A.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"object"</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]B.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">null</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]C.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"object"</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

3，以下表达式的运行结果是：

<code class="hljs css has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-attr_selector" style="color: rgb(0, 136, 0); box-sizing: border-box;">[[3,2,1]</span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.reduce</span>(<span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">Math</span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.pow</span>),<span class="hljs-attr_selector" style="color: rgb(0, 136, 0); box-sizing: border-box;">[]</span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.reduce</span>(<span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">Math</span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.pow</span>)]<span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">A</span>.报错<span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">B</span>.<span class="hljs-attr_selector" style="color: rgb(0, 136, 0); box-sizing: border-box;">[9,0]</span><span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">C</span>.<span class="hljs-attr_selector" style="color: rgb(0, 136, 0); box-sizing: border-box;">[9,NaN]</span><span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">D</span>.<span class="hljs-attr_selector" style="color: rgb(0, 136, 0); box-sizing: border-box;">[9,undefined]</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

4，以下表达式的运行结果是：

<code class="hljs scala has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">val</span> = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'value'</span>;console.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Value id '</span>+(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">val</span> === <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'value'</span>)?<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Something'</span>:<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Nothing'</span>);A.SomethingB.NothingC.NaND.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>

5，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> name = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'World'</span>;(<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>{</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">typeof</span> name === <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'undefined'</span>){        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> name = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Jack"</span>;        console.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Goodbye '</span>+ name);    }<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{        console.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Hello '</span> + name);    }})();A.Goodbye JackB.Hello JackC.Goodbye <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span>D.Hello <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>

6，以下表达式的运行结果是：

<code class="hljs delphi has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">END</span> = Math.pow(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">53</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> START = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">END</span> -<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> count = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> i = START ; i <= <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">END</span> ;i++)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">{count ++;}</span>console.log(count);A.<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>B.<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>C.<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">101</span>D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>

7，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> arr = [<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>];arr[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>] = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>;arr.filter(<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(x)</span>{</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> x === <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span>});A.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span> x <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>]B.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>]C.[]D.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

8，以下表达式的运行结果是：

<code class="hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">var</span> two <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.2</span>;<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">var</span> one <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.1</span>;<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">var</span> eight <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.8</span>;<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">var</span> six <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.6</span>;<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">[</span>two <span class="hljs-attribute" style="box-sizing: border-box;">-one</span> <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">==</span> one,eight<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-</span> six <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">==</span> two<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">]</span><span class="hljs-markup" style="box-sizing: border-box;">;A.</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">[</span><span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">]</span><span class="hljs-markup" style="box-sizing: border-box;">B.</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">[</span><span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">]</span><span class="hljs-markup" style="box-sizing: border-box;">C.</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">[</span><span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">]</span><span class="hljs-markup" style="box-sizing: border-box;">D.其他</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>

9，以下表达式的运行结果是：

<code class="hljs coffeescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-reserved" style="box-sizing: border-box;">function</span> showCase(value){<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span>(value){    <span class="hljs-reserved" style="box-sizing: border-box;">case</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'A'</span>:        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Case A'</span>);        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;    <span class="hljs-reserved" style="box-sizing: border-box;">case</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'B'</span>:        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Case B'</span>);        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;    <span class="hljs-reserved" style="box-sizing: border-box;">case</span> <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span> :        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'undefined'</span>);        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;    <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(0, 136, 0);">default</span>:        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Do not know!'</span>);    }}showCase(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> String(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'A'</span>));A.Case AB.Case BC.Do <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> knowD.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul>

10，以下表达式的运行结果是：

<code class="hljs coffeescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-reserved" style="box-sizing: border-box;">function</span> showCase(value){    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span>(value){        <span class="hljs-reserved" style="box-sizing: border-box;">case</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'A'</span>:            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Case A'</span>);            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;        <span class="hljs-reserved" style="box-sizing: border-box;">case</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'B'</span>:            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Case B'</span>);            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;        <span class="hljs-reserved" style="box-sizing: border-box;">case</span> <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span> :            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'undefined'</span>);            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;        <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(0, 136, 0);">default</span>:            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">console</span>.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Do not know!'</span>);    }}showCase(String(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'A'</span>));A.Case AB.Case BC.Do <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> knowD.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li></ul>

11，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">isOdd</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(num)</span>{</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> num % <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span> == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>;}<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">isEven</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(num)</span>{</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> num % <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span> == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;}<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">isSane</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(num)</span>{</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> isEven(num)||isOdd(num);}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> values = [<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'13'</span>,-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">9</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">Infinity</span>];values.map(isSane);A.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]B.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]C.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]D.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li></ul>

12，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">parseInt</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span>),<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">parseInt</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>),<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">parseInt</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)]A.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>]B.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">NaN</span>]C.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">NaN</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">NaN</span>]D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

13，以下表达式的运行结果是：

<code class="hljs vbscript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Array</span>.<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">isArray</span>(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Array</span>.prototype)A.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>B.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>C.报错D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

14，以下表达式的运行结果是：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">var <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span> = [<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>([<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>]){    console.info(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span> == <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{    console.info(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"else"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>}<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">A</span>.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>B.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>C.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"else"</span>D.其他 </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>

15，以下表达式的运行结果是：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[]==[]<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">A</span>.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>B.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>C.报错D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

16，以下表达式的运行结果是：

<code class="hljs mathematica has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'5'</span>+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>),(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'5'</span>-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>)]A.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"53"</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>]B.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>]<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">C</span>.报错<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">D</span>.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

17，以下表达式的运行结果是：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>+-+++-+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span><span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">A</span>.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>B.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>C.报错D.其他 </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

18，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> arr = <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Array</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>);arr[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>] = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>arr.map(<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(elem)</span>{</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'1'</span>;});A.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>]B.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1"</span>]C.[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1"</span>]D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

19，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">sidEffecting</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(arr)</span>{</span>arr[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>] = arr[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>];}<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">bar</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(a,b,c)</span>{</span>c = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>;sidEffecting(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">arguments</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> a+b+c;}bar(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>);A<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.3</span>B<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.12</span>C.报错D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>

20，以下表达式的运行结果是：

<code class="hljs mathematica has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">var a = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">111111111111111110000</span>;b = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1111</span>;console.info(a+b);A<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.111111111111111111111</span>B<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.111111111111111110000</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">C</span>.NaN<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">D</span>.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Infinity</span> </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

21，以下表达式的运行结果是：

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">ar <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">x</span> = []<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.reverse</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">x</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>A.[]B<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.undefined</span>C.报错D<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.window</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>

22，以下表达式的运行结果是：

<code class="hljs mathematica has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Number</span>.MIN_VALUE><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>A.trueB.false<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">C</span>.报错<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">D</span>.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

23，以下表达式的运行结果是：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span><<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span><<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span><<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span><<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>]<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">A</span>.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]B.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>,<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]C.报错D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

24，以下表达式的运行结果是：

<code class="hljs lua has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span> == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">[[[2]]</span>]A.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>B.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>C.undefinedD.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

25，以下表达式的运行结果是：

<code class="hljs lua has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3.</span>toString(),<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3.</span>.toString(),<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3.</span>..toString()]A.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"3"</span>,<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>,<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>]B.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"3"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"3.0"</span>,<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>]C.[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"3"</span>,<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>]D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

26，以下表达式的运行结果是：

<code class="hljs lua has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">(<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span></span>{var x1 =y1 =<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>;})();console.info(y1);console.info(x1);A<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.1</span>，<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>B.<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>，<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>C<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.1</span>，<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">error</span>D.其他</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>

27，以下表达式的运行结果是：

<code class="hljs php has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> a = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Function</span>.<span class="hljs-title" style="box-sizing: border-box;">length</span>,    <span class="hljs-title" style="box-sizing: border-box;">b</span> = <span class="hljs-title" style="box-sizing: border-box;">new</span> <span class="hljs-title" style="box-sizing: border-box;">Function</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>.<span class="hljs-title" style="box-sizing: border-box;">length</span>;</span>a === bA.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>B.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>C.errorD.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

28，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> a = <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Date</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> b = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Date</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> c = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Date</span>();[a === b, b === c, a === c]A.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]B.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]C.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]D.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

29，以下表达式的运行结果是：

<code class="hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">var</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">min</span> <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> Math<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">min</span>(), <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">max</span> <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> Math<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">max</span>()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">min</span> <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;"><</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">max</span>A<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span><span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>B<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span><span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>C<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>errorD<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

30，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">captureOne</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(re, str)</span> {</span>  <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> match = re.exec(str);  <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> match && match[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>];}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> numRe  = <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/num=(\d+)/ig</span>,    wordRe = <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/word=(\w+)/i</span>,    a1 = captureOne(numRe,  <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"num=1"</span>),    a2 = captureOne(wordRe, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"word=1"</span>),    a3 = captureOne(numRe,  <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"NUM=2"</span>),    a4 = captureOne(wordRe,  <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"WORD=2"</span>);[a1 === a2, a3 === a4]A.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]B.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]C.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]D.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>

31，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> a = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Date</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"2014-03-19"</span>),    b = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Date</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2014</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">03</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>);[a.getDay() === b.getDay(), a.getMonth() === b.getMonth()]A.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]B.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]C.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]D.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

32，以下表达式的运行结果是：

<code class="hljs mel has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'http://giftwrapped.com/picture.jpg'</span>.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">match</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'.gif'</span>)) {  <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'a gif file'</span>} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {  <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'not a gif file'</span>}A.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'a gif file'</span>B.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'not a gif file'</span>C.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">error</span>D.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>

33，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">foo</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(a)</span> {</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> a;    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> a;}<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">bar</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(a)</span> {</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> a = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'bye'</span>;    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> a;}[foo(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'hello'</span>), bar(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'hello'</span>)]A.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"hello"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"hello"</span>]B.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"hello"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"bye"</span>]C.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"bye"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"bye"</span>]D.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>

34，以下表达式的运行结果是：

<code class="hljs python has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">var a = {<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span>:</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Animal"</span>, name: <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Fido'</span>};a.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span>A.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Animal"</span>B.ObjectC.an errorD.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

35，以下表达式的运行结果是：

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">var a = new Date(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"epoch"</span>)A<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Thu</span> Jan <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">01</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1970</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">01</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span> GMT+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0100</span> (CET)B<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.current</span> timeC<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.error</span>D<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.other</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

36，以下表达式的运行结果是：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">var <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span> = /<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">123</span>/,    b = /<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">123</span>/<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span><span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span> == b<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span> === b<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">A</span>.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>B.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>C.<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>D.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

37，以下表达式的运行结果是：

<code class="hljs livecodeserver has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">What is <span class="hljs-operator" style="box-sizing: border-box;">the</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">result</span> <span class="hljs-operator" style="box-sizing: border-box;">of</span> this expression? (<span class="hljs-operator" style="box-sizing: border-box;">or</span> multiple ones)var <span class="hljs-operator" style="box-sizing: border-box;">a</span> = [<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>],    b = [<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>],    c = [<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>]<span class="hljs-operator" style="box-sizing: border-box;">a</span> ==  b<span class="hljs-operator" style="box-sizing: border-box;">a</span> === b<span class="hljs-operator" style="box-sizing: border-box;">a</span> >   c<span class="hljs-operator" style="box-sizing: border-box;">a</span> <   cA.<span class="hljs-constant" style="box-sizing: border-box;">false</span>, <span class="hljs-constant" style="box-sizing: border-box;">false</span>, <span class="hljs-constant" style="box-sizing: border-box;">false</span>, <span class="hljs-constant" style="box-sizing: border-box;">true</span>B.<span class="hljs-constant" style="box-sizing: border-box;">false</span>, <span class="hljs-constant" style="box-sizing: border-box;">false</span>, <span class="hljs-constant" style="box-sizing: border-box;">false</span>, <span class="hljs-constant" style="box-sizing: border-box;">false</span>C.<span class="hljs-constant" style="box-sizing: border-box;">true</span>, <span class="hljs-constant" style="box-sizing: border-box;">true</span>, <span class="hljs-constant" style="box-sizing: border-box;">false</span>, <span class="hljs-constant" style="box-sizing: border-box;">true</span>D.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul>

38，以下表达式的运行结果是：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">var <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span> = {}, b = Object.prototype<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span>.prototype === b, Object.getPrototypeOf(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">a</span>) === b]<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">A</span>.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]B.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]C.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]D.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

39，以下表达式的运行结果是：

<code class="hljs php has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">f</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span> {</span>}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> a = f.prototype, b = Object.getPrototypeOf(f);a === bA.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>B.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>C.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>D.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

40，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">foo</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span> {</span> }<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> oldName = foo.name;foo.name = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"bar"</span>;[oldName, foo.name]A.errorB.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">""</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">""</span>]C.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"foo"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"foo"</span>]D.[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"foo"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"bar"</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

41，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1 2 3"</span>.replace(<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/\d/g</span>, <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">parseInt</span>)A.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1 2 3"</span>B.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"0 1 2"</span>C.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"NaN 2 3"</span>D.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1 NaN 3"</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

42，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">f</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span> {</span>}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> parent = <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Object</span>.getPrototypeOf(f);f.name <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// ?</span>parent.name <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// ?</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">typeof</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">eval</span>(f.name) <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// ?</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">typeof</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">eval</span>(parent.name) <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//  ?</span>A.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"f"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Empty"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"function"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"function"</span>B.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"f"</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">undefined</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"function"</span>, errorC.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"f"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Empty"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"function"</span>, errorD.other</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

43，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> lowerCaseOnly =  <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/^[a-z]+$/</span>;[lowerCaseOnly.test(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">null</span>), lowerCaseOnly.test()]A.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]B.errorC.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]D.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

44，以下表达式的运行结果是：

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> lowerCaseOnly =  <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/^[a-z]+$/</span>;[lowerCaseOnly.test(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">null</span>), lowerCaseOnly.test()]A.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>]B.errorC.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]D.[<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">false</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>]</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

45，以下表达式的运行结果是：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[,,,].join(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">", "</span>)<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">A</span>.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">", , , "</span>B.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"undefined, undefined, undefined, undefined"</span>C.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">", , "</span>D.<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">""</span></code>