Ajax成功未运行

Question

So im having a weird issue. I made a small application on my machine that works fine but when I upload to a school server it stops working. What I am doing is accessing json data with ajax. I have tested and I am getting the correct json responses, I am connecting to the database just fine and the ajax is running every two seconds as it should. But the code in the success section of the ajax never runs. The database on the server is identical to the one on my machine, the connection has been troubleshooted and works great but still the ajax success code doesn't run. Thanks in advance!

setInterval(function () {
            $.ajax({
                type: 'GET',
                url: 'JSONFile.php',
                dataType: 'json',
                success: function (retrieved) {
                    $.each(retrieved, function (index, i) {
                         alert('This line of code is the problem. This alert does not run but should');
                    });
                }
            });
        }, 2000);

Answer 1

jQuery 3 is coded using done, fail and always

// Assign handlers immediately after making the request,
// and remember the jqXHR object for this request
var jqxhr = $.ajax( "example.php" )
  .done(function() {
    alert( "success" );
  })
  .fail(function() {
    alert( "error" );
  })
  .always(function() {
    alert( "complete" );
  });

https://api.jquery.com/jQuery.ajax/

Deprecation Notice: The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callbacks are removed as of jQuery 3.0. You can use jqXHR.done(), jqXHR.fail(), and jqXHR.always() instead.