querystring的处理类

        /*
        *   对于querystring（形如?userid=222&username=23432sdf）的处理
        */
        function PageQuery(q) {
            if (q.length > 1)
                this.q = q.substring(1, q.length);
            else
                this.q = null;
            //定义键值对
            this.keyValuePairs = new Array();
            if (this.q) {
                var infos = this.q.split("&");
                for (var i = 0; i < infos.length; i++) {
                    //将参数添加到数组中
                    this.keyValuePairs.push(infos[i]);
                }
            }
            this.getKeyValuePairs = function () { return this.keyValuePairs };

            //获得当前参数的个数
            this.getLength = function () { return this.keyValuePairs.length };

            //根据输入的key，找出相应的value
            this.getValue = function (s) {
                var length = this.getLength();
                for (var i = 0; i < length; i++) {
                    if (this.keyValuePairs[i].split("=")[0] == s)
                        return this.keyValuePairs[i].split("=")[1];
                }
            };

            //获得所有参数
            this.getParameters = function () {
                var parameters = new Array();
                var length = this.getLength();
                for (var i = 0; i < length; i++) {
                    parameters.push(this.keyValuePairs[i].split("=")[0]);
                }
                return parameters;
            }
        }

        function analysisUrl() {
            //可以用this.location.search取得？后面的参数
//            alert(this.location.search);
            var page = new PageQuery("?userid=234&username=sdfsd");
            //            alert(page.getLength());
            alert(page.getValue("username"));
            var params = page.getParameters();
            for (var i = 0; i < params.length; i++) {
                alert(params[i]);
            }
        }
    </script>
通过以上的例子验证，这个类别是可以用的。