phpcms v9 导航显示二级栏目

{pc:content action="category" catid="0" num="25" siteid="$siteid" order="listorder asc"}
 {loop $data $r}
 <li class="cat-item">
  <a href="{$r[url]}">{$r[catname]}</a>
   {if $r['catid']}
    {pc:content action="category" catid="$r[catid]" num="15" siteid="$siteid" order="listorder asc" return=subdata}
    {if $subdata}
    <ul class="children">
     {loop $subdata $sub}
     <li class="cat-item"><a href="{$sub[url]}">{$sub[catname]}</a></li>
     {/loop}
    </ul>
    {/if}
    {/pc}
   {/if}
 </li>
 {/loop}
{/pc}