在ajax加载时添加div

I put this code:

<script type='text/javascript' src='http://code.jquery.com/jquery-2.1.0.min.js'></script>
<script type="text/javascript">
 $(document).ajaxStart(function() {
  $("#loading-image").show();
});

$(document).ajaxStop(function() {
  $("#loading-image").hide();
});

on the top of the page...

and I have HTML:

<body style="">
<div id="loading-image" style="width:100%; height:100%; background:#ccc; display:none;"></div>

But I dont see ID loading image on ajax... What can be a problem here?

From the limited amount that you posted, it doesn't look like you're actually making an AJAX request. http://jsfiddle.net/volte/A66C8/

Try then making an ajax call when the page loads:

$.ajax({
  url: "test.html",
  context: document.body
});

Disclaimer: I have not tested this. Pulled from http://api.jquery.com/jQuery.ajax/

In addition, make sure you wrap those methods in an onload. Most people do:

(function() {
  //... your code here ...
  //... will be run on load...
});

The code doesn't seems to have anything wrong, make sure that those methods are in fact beeing called whenever you use ajax, put a breakpoint in the element inspector. Also check if when you manually remove display:none from the "loading-image" div you can see it on the screen, just to be sure.