嵌套的ajax请求

 1 //发送一个ajax请求，嵌套的ajax请求
 2 ‘ajaxCall‘: function(url1, data1, url2, data2){
 3     var returnValue = ‘‘;
 4     $.ajax({
 5         type: "POST",
 6         url: url1,
 7         async: false,
 8         data: data1,
 9         success: function(data3) {
10             //TODO
11             //外层ajax响应成功，就再次发送ajax请求到第二个地址
12             $.ajax({
13                 type: "POST",
14                 url: url2,
15                 data: data2,
16                 async: false,
17                 success: function(data4) {
18                     //TODO
19                 }
20             });
21         }
22     });
23     return returnValue;
24 }