仅供新手参考学习，欢迎大家提出更多的实现方法。
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<title>隔行变色</title>
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<h3>这是隔行变色啊..</h3>
<ul>
<li><a href="" alt="">这是隔行变色啊...</a><em>(2009-8-20)</em></li>
<li><a href="" alt="">这是隔行变色啊...</a><em>(2009-8-20)</em></li>
<li><a href="" alt="">这是隔行变色啊...</a><em>(2009-8-20)</em></li>
<li><a href="" alt="">这是隔行变色啊...</a><em>(2009-8-20)</em></li>
<li><a href="" alt="">这是隔行变色啊...</a><em>(2009-8-20)</em></li>
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