在ajax请求体外得到请求 数据

   function sendAjax() {

         $.ajax({

             type: "post",

             url: "/flow/process/trace.afca?pid=" + pid + "&ratio=1.3",

             dataType: 'json',

             async: false,

             success: function (response) {

                 getDate = response;

             }

         });

         return getDate;

     }

     setInterval(function () {

         sendAjax();

         newDate = getDate;

         return newDate

     }(), 3000);