<div class="four">
<h2>电子商务</h2>
<img src="images/photo2.gif" alt="" />
<ul>
<li><a href="#">方便的订单管理1</a></li>
<li><a href="#">方便的订单管理2</a></li>
<li><a href="#">方便的订单管理3</a></li>
<li><a href="#">方便的订单管理4</a></li>
<li><a href="#">方便的订单管理5</a></li>
</ul>
</div>
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
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<div>
<ul id="art">
<li><a href="#">文章1</a></li>
<li><a href="#">文章1</a></li>
<li><a href="#">文章1</a></li>
<li><a href="#">文章1</a></li>
<li><a href="#">文章1</a></li>
<li><a href="#">文章1</a></li>
<li><a href="#">文章1</a></li>
</ul>
</div>
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火狐浏览器用的是li的高度,IE可以直接设a标签的高度
<div id="header">
<img src="images/logo.png" id="logo"/>
<ul id="nav">
<li><a href="#">导航1</a></li>
<li><a href="#">导航2</a></li>
<li><a href="#">导航3</a></li>
<li><a href="#">导航4</a></li>
<li><a href="#">导航5</a></li>
<li><a href="#">导航6</a></li>
<li><a href="#">导航7</a></li>
</ul>
</div>
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