js 代码

<textarea cols="50" rows="15" name="code" class="javascript">1、四舍五入函数：//number为某实数，n为要保留的小数位数function myRound(number,n) { number = Math.round(number*Math.pow(10,n))/Math.pow(10,n); return number; }2、文本框中只能输入数字的函数：//只能输入数字//用法 &lt;input name=&quot;old&quot; type=&quot;text&quot; ONKEYPRESS=&quot;event.returnValue=IsDigit();&quot;&gt;function IsDigit() { return ((event.keyCode &gt;= 48) &amp;&amp; (event.keyCode &lt;= 57));}3、去除字符串中的空格的函数：//去空格函数//用法 str = cTrim(str,0);function cTrim(sInputString,iType) {var sTmpStr = ' ';var i = -1;if(iType == 0 || iType == 1){while(sTmpStr == ' '){++i;sTmpStr = sInputString.substr(i,1);}sInputString = sInputString.substring(i);}if(iType == 0 || iType == 2){sTmpStr = ' ';i = sInputString.length;while(sTmpStr == ' '){--i;sTmpStr = sInputString.substr(i,1);}sInputString = sInputString.substring(0,i+1);}return sInputString;}4、在表格上完全屏蔽鼠标右键：&lt;table oncontextmenu=&quot;return(false)&quot;&gt;&lt;tr&gt;&lt;td&gt;可在此加入网页元素&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;5、取消选取、防止复制：&lt;body onselectstart=&quot;return false&quot;&gt;6、去掉图片链接点击后周围的虚线：&lt;a href=&quot;#&quot; mce_href=&quot;#&quot; onFocus=&quot;this.blur()&quot;&gt;&lt;img src=&quot;picName.jpg&quot; mce_src=&quot;picName.jpg&quot; border=0&gt;&lt;/a&gt;7、在子窗口中刷新父窗口：window.opener.location.reload();8、设定打开页面的大小：&lt;body onload=&quot;top.resizeTo(300,200);&quot;&gt;&lt;body onload=&quot;top.moveBy(300,200);&quot;&gt;</textarea>