<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$(document).ajaxSend(function(e,xhr,opt){
$("div").append("<p>从网址请求数据： " + opt.url + "</p>");
});
$("button").click(function(){
$("div").load("demo_ajax_load.php");
});
});
</script>
</head>
<body>
<div><h2>Let AJAX change this text</h2></div>
<button>Change Content</button>
</body>
</html>