​x
 
<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("div").ajaxStart(function(){
    $(this).html("<img src='/i/demo_wait.gif' />");
  });
  $("button").click(function(){
    $("div").load("/example/jquery/demo_ajax_load.asp");
  });
});
</script>
</head>
​
<body>
​
<div id="txt"><h2>通过 AJAX 改变文本</h2></div>
<button>改变内容</button>
​
</body>
</html>
​