在javascript中如何去除字符串两头的空格

<SCRIPT LANGUAGE="JavaScript">


<!--


// 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>

使用例子如下：


<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 ';">