从父ajax调用问题引用的数据

        $.ajax({
              url: '../...',
              type: 'POST',
              dataType: 'JSON',                         
              success: function(data){
                      if (data.length) {

                     // complex and unreadable code
                    // cannot be posted here.

                      $.ajax({
                      url: '../library/index.php?action=librarydetailssearch',
                      type: 'POST',
                      dataType: 'JSON',
                      data: {studentid:studentid},
                                            asyn: false,
                                            success: function(data){
                                            if (data.length) {
                                         }
                                     }
                         });

                       }
                    });