Ajax提交请求模板

  function methodName() {
             var params = {

             };
             var url = '';
             jQuery.ajax({
                 type: 'POST',
                 contentType: 'application/x-www-form-urlencoded',
                 url: url,
                 data: params,
                 dataType: 'json',
                 success: function (data) {

                     alert("成功啦");
                 },
                 error: function (data) {
                     alert("失败啦");
                 }
             });
         }