js跨域 jsop 使用

如：

 $.ajax({
                    url: "http://www.XXX.com?cb=qrymylist_callback",
                    dataType: "jsonp",
                    jsonp: "qrymylist_callback",
                    type: "get",
                    cache: false,
                    data: "Uin=" + MGR.getUinNum(MGR.appcookie("uin")) + "&skey=" + MGR.appcookie("skey") + "&Uname=" + encodeURIComponent(MGR.Uname)
                });
            }

function qrymylist_callback(a) {
    //回调函数
}

  服务器端：   qrymylist_callback({"ret":"服务器异常,请稍后重试!","retcode":"10"})