在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
	$(document).ajaxStart(function(){
		$("#wait").css("display","block");
	});
	$(document).ajaxComplete(function(){
		$("#wait").css("display","none");
	});
	$("button").click(function(){
		$("#txt").load("demo_ajax_load.php");
	});
});
</script>
</head>
<body>

<div id="txt"><h2>使用 AJAX 修改文本</h2></div>
<button>修改内容</button>
<div id="wait" style="display:none;width:69px;height:89px;border:1px solid black;position:absolute;top:50%;left:50%;padding:2px;"><img src='demo_wait.gif.html' width="64" height="64" /><br>Loading..</div>

</body>
</html>
源代码

动行结果
