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<title>js实现的无限级树形下拉导航列表 </title>
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<h2>js实现无限级树形导航列表</h2>
<ul id="nav">
<li><a href="#">产品目录</a>
<ul>
<li><a href="#">大类别一</a>
<ul>
<li><a href="#">小类别一</a>
<ul>
<li><a href="#">次类别一</a></li>
<li><a href="#">次类别二</a></li>
</ul>
</li>
<li><a href="#">小类别二</a></li>
</ul>
</li>
<li><a href="#">大类别二</a></li>
<li><a href="#">大类别三</a>
<ul>
<li><a href="#">小类别一</a></li>
<li><a href="#">小类别二</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">服务</a>
<ul>
<li><a href="#">大类别一</a>
<ul>
<li><a href="#">小类别一</a></li>
<li><a href="#">小类别二</a></li>
</ul>
</li>
<li><a href="#">大类别二</a>
<ul>
<li><a href="#">小类别一</a></li>
<li><a href="#">小类别二</a></li>
</ul>
</li>
<li><a href="#">大类别三</a>
<ul>
<li><a href="#">小类别一</a></li>
<li><a href="#">小类别二</a></li>
</ul>
</li>
</ul>
</li>
</ul>
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