JS获取URL参数

        //获取URL的参数
        var $_GET = (function () {
            var url = window.document.location.href.toString();
            var u = url.split("?");
            if (typeof (u[1]) == "string") {
                u = u[1].split("&");
                var get = {};
                for (var i in u) {
                    var j = u[i].split("=");
                    get[j[0]] = j[1];
                }
                return get;
            } else {
                return {};
            }
        })();