function queryParams(){
        var queryStr = window.location.search.substring(1);
        var paramsArr = queryStr.split('&');
        var tmp;
        var params = {};
        for (var i = 0; i < paramsArr.length;i++){
            tmp = paramsArr[i].split('=');
            params[tmp[0]] = tmp[1];
        }
        return params;
    }