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);