用js写一个模板引擎

来源：互联网发布：明解c语言实践篇pdf 编辑：程序博客网时间：2024/05/18 03:41
模板引擎在前后端都能用到，但是通过作为前端，我们只需要一些简单的模板引擎。
先上代码：
<code class="hljs xml 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-doctype" style="color: rgb(102, 0, 102); box-sizing: border-box;"><!DOCTYPE html></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">html</span>></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">head</span>></span>    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">title</span>></span>模板引擎<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">title</span>></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">head</span>></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">body</span>></span>    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">div</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">id</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"tpl"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">type</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"text/plain"</span>></span>        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">p</span>></span>Today: { date }<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">p</span>></span>        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">a</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">href</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"/{ user.id|safe }"</span>></span>{ user.company }<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">a</span>></span>    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">div</span>></span>    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">script</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">src</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://libs.baidu.com/jquery/1.9.0/jquery.js"</span>></span><span class="javascript" style="box-sizing: border-box;"></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">script</span>></span>    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">script</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">type</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"text/javascript"</span>></span><span class="javascript" style="box-sizing: border-box;">        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> tpl = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Template($(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'#tpl'</span>).html());        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> date= <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-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> model = tpl.render({            date: date,            user: {                id: <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'0000'</span>,                company: <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'babybus'</span>            }        });        $(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'#tpl'</span>).html(model);        <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;">Template</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(tpl)</span> {</span>            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span>                fn,                match,                code = [<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'var r=[];\nvar _html = function (str) { return str.replace(/&/g, \'&amp;\').replace(/"/g, \'&quot;\').replace(/\'/g, \'&#39;\').replace(/</g, \'&lt;\').replace(/>/g, \'&gt;\'); };'</span>],                re = <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/\{\s*([a-zA-Z\.\_0-9()]+)(\s*\|\s*safe)?\s*\}/m</span>,                addLine = <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;">(text)</span> {</span>                    code.push(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'r.push(\''</span> + text.replace(<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/\'/g</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\\\''</span>).replace(<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/\n/g</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\\n'</span>).replace(<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/\r/g</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\\r'</span>) + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\');'</span>);                };            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> (match = re.exec(tpl)) {                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (match.index > <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>) {                    addLine(tpl.slice(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, match.index));                }                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (match[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>]) {                    code.push(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'r.push(String(this.'</span> + match[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>] + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'));'</span>);                }                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {                    code.push(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'r.push(_html(String(this.'</span> + match[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>] + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">')));'</span>);                }                tpl = tpl.substring(match.index + match[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>].length);            }            addLine(tpl);            code.push(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'return r.join(\'\');'</span>);            fn = <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;">Function</span>(code.join(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\n'</span>));            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>.render = <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;">(model)</span> {</span>                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> fn.apply(model);            };        }    </span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">script</span>></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">body</span>></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">html</span>></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><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li></ul>
这个我们能用这个模板引擎创建一个我们前端需要的html片段了。
这里面我们使用正则表达式去匹配字符串中的变量，当然，你要对js正则表达式熟练应用。
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