调用代码： 

{loop $MODULE $m}{if $m[ismenu]}
              <ul>
                <li class="tit">{$m[name]}</li>
                <!--{php $tags=tag("table=category&condition=parentid=0 and moduleid=".$m[moduleid]."&pagesize=10&order=listorder asc&template=null");}-->
                {loop $tags $i $t}
                <li><a href="{cat_url($t[catid])}">{$t[catname]}</a></li>
               {/loop}
              </ul>
              {/if}{/loop}

样式自己改，主要是在导航菜单下拉循环出顶级分类