我们在调用二级菜单的时候，会遇到这样的问题，如果有子栏目，就显示二级菜单，如果没有就不显示，下面给出代码：

{dede:channelartlist row=8 typeid='1,2,3,4,5'}<li class="tab dropdown">     <a href="{dede:field.typeurl/}" class="tablink arwlink" title="{dede:field.typename/}">    {dede:field.typename/}</a>     {dede:field name=typeid runphp="yes"}     global $dsql; $sql = "SELECT id From `dede_arctype` WHERE reid='@me' And ishidden<>1 order by sortrank asc limit 0, 100 ";     $row = $dsql->GetOne($sql);     @me=is_array($row)?'<ul class="subnav">':'';     {/dede:field}     {dede:channel type='son' noself='yes' }         <a href="[field:typeurl/]">[field:typename/]</a>     {/dede:channel}          {dede:field name=typeid runphp="yes"}     global $dsql; $sql = "SELECT id From `dede_arctype`     WHERE reid='@me' And ishidden<>1 order by sortrank asc limit 0, 100 ";     $row = $dsql->GetOne($sql);     @me=is_array($row)?'</ul>':'';          {/dede:field}</li>{/dede:channelartlist}

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