dede循环出二级栏目及对应的三级栏目
{dede:channelartlist typeid=3 }
<dd>
<dl>
<dt><a href="{dede:field name='typeurl'/}">{dede:field name='typename'/}</a></dt>
<dd>
<ul>
{dede:sql sql='Select * from `dede_arctype` where reid=~id~ ORDER BY id'}
<li>· <a href="[field:typedir function="cn_substr(@me,200,9) " /]">[field:typename/]</a></li>
{/dede:sql}
</ul>
</dd>
</dl>
</dd>
{/dede:channelartlist}