Js 实现trim方法

<SCRIPT LANGUAGE="JavaScript">
<!--
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>