js去除空格

str为要去除空格的字符串:

去除所有空格:

str = str.replace(/\s+/g,"");

去除两头空格:

str = str.replace(/^\s+|\s+$/g,"");

去除左空格：

str=str.replace( /^\s*/, '');

去除右空格：

str=str.replace(/(\s*$)/g, "");

SCRIPT LANGUAGE="JavaScript">

<!--

//出处:网上搜集

// Trim() , Ltrim() , RTrim()

String.prototype.Trim = function()

{

return this.replace(/(^\s*)|(\s*$)/g, "");

}

String.prototype.LTrim = function()

{

return this.replace(/(^\s*)/g, "");

}

String.prototype.RTrim = function()

{

return this.replace(/(\s*$)/g, "");

}

//-->

</SCRIPT>

<input type="text" value=" 前后都是空格 " id="space">

<input type="button" value="去前后空格"onclick="javascript:document.getElementById('space').value=document.getElementById('space').value.Trim();document.getElementById('space').select();">

<input type="button" value="去前空格"onclick="javascript:document.getElementById('space').value=document.getElementById('space').value.LTrim();document.getElementById('space').select();">

<input type="button" value="去后空格"onclick="javascript:document.getElementById('space').value=document.getElementById('space').value.RTrim();document.getElementById('space').select();">

<input type="button" value="还原" onclick="javascript:document.getElementById('space').value=' 前后都是空格 ';">

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去除所有空格:

str = str.replace(/\s+/g,"");

去除两头空格:

str = str.replace(/^\s+|\s+$/g,"");

去除空格(TimeSheet用过)

arg0=arg0.replace(/\s+$|^\s+/g,"");

来自：http://hi.baidu.com/qihuitoday/blog/item/eff2f1fbd22229116c22ebe5.html