<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.49028c.com/" />
<title>武林網</title>
<style type="text/css">
span{color:red;}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#btn").click(function(){
$("span").text($("li").length);
})
});
</script>
</head>
<body>
<div>
<ul>
<li>后臺專區</li>
<li>前臺專區</li>
<li>數據庫專區</li>
<li>站長交流</li>
</ul>
</div>
<div>li元素集合中li元素的數量:<span></span></div>
<button id="btn">點擊查看實例</button>
</body>
</html>
