javascript中去掉空格

<script language=Javascript> //自己动手为string添加Trimfunction String.prototype.Trim() {return this.replace(/(^\s*)|(\s*$)/g,"");}function String.prototype.Ltrim(){return this.replace(/(^\s*)/g, "");}function String.prototype.Rtrim(){return this.replace(/(\s*$)/g, "");}var str = " aaa ";alert(str.Trim());</script>

0 - 去除前后空格; 1 - 去前导空格; 2 - 去尾部空格