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<li class="zhuanqu">html專區</li>
<li class="zhuanqu">div+css專區</li>
<li class="zhuanqu">jQuery專區</li>
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<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.49028c.com/" />
<title>武林網</title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").click(function(){
$(":first").css("color","green")
})
})
</script>
</head>
<body>
<div>
<ul>
<li class="zhuanqu">html專區</li>
<li class="zhuanqu">div+css專區</li>
<li class="zhuanqu">jQuery專區</li>
<li class="zhuanqu">Javascript專區</li>
</ul>
<div>
<span>武林網</span>
<span>太陽出來了</span>
</div>
</div>
<button>點擊查看效果</button>
</body>
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