<script type="text/javascript" language="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,"");　　 } </script><script type="text/javascript" language="JavaScript">    function test() {        var a = "abcdef".startWith("abc");        alert("a : " + a);        var b = "abcdef".endWith("def");        alert("b : " + b);    }    String.prototype.endWith = function(str) {        if (str == null || str == "" || this.length == 0                || str.length > this.length)            return false;        if (this.substring(this.length - str.length) == str)            return true;        else            return false;        return true;    }    String.prototype.startWith = function(str) {        if (str == null || str == "" || this.length == 0                || str.length > this.length)            return false;        if (this.substr(0, str.length) == str)            return true;        else            return false;        return true;    }</script>