$.ajax({                                               dataType: "json",                                               async: false,  //只需将此属性设置为false                                               url: ~~,                                                                                           type: "GET",                                               success: function (data) {                                                   if (data != null) {                                                       $(data).each(function (index) {                                                                                                                });                                                   }                                               }                                           });                                       }