类选择器
<title></title>
<head>
<style type="text/css">
div.ffff {font-size:140px;120px;}
</style>
</head>
<h3>例子</h3>
<p title="选择你最喜欢的水果.">你最喜欢的水果是?</p>
<ul>
<li id='aaa'>苹果</li>
<li id='bbb'> 橘子</li>
<li id='ccc'>菠萝</li>
</ul>
<a>豆腐</a>
<div class='ffff'>牛奶</div>
<div class='gggg'>可乐</div>
<div class='hhhh'>雪碧</div>
<script src="jquery-1.6.4.js" type="text/javascript"></script>