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()
{
returnthis.replace(/(^\\s*)|(\\s*$)/g, "");
}
String.prototype.LTrim = function()
{
returnthis.replace(/(^\\s*)/g, "");
}
String.prototype.RTrim = function()
{
returnthis.replace(/(\\s*$)/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,"");
来源：http://www.cnblogs.com/fumj/p/3406420.html