自定义删除空格函数

<script type="text/javascript">  
    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,"");}
    var str="  abc  cd  ";
    var Lstr="  abc  cd  ";
    var Rstr="  abc  cd  "; 
    str=str.Trim();
    Lstr=Lstr.LTrim();
    Rstr=Rstr.RTrim();
    window.document.write("*"+str+"*"+"<br>");
    window.document.write("*"+Lstr+"*"+"<br>");
    window.document.write("*"+Rstr+"*"+"<br>");
</script>