解析url中search

var Request=new QueryString();

function QueryString(){        var aa = "";        var name, value, i;        var str = location.href;        var num = str.indexOf("?")        str = str.substr(num + 1);        var arrtmp = str.split("&");        for (i = 0; i < arrtmp.length; i++) {            num = arrtmp[i].indexOf("=");            if (num > 0) {                name = arrtmp[i].substring(0, num);                value = arrtmp[i].substr(num + 1);                this[name] = value;            }        }    }