phpcms如何调二级导航

<div>
  <ul>
    <li><a href="{siteurl($siteid)}">首页</a></li>
    {pc:content action="category" catid="0" num="10" siteid="$siteid" order="listorder ASC"}
    {loop $data $r}
    <li><a href="{$r[url]}">{$r[catname]}</a>
      {if $r[arrchildid]}
      <ul>
        {pc:content action="category" catid="$r[catid]" num="10" siteid="$siteid" order="listorder ASC" return="data2"}
        {loop $data2 $v}
        <li><a href="{$v[url]}">{$v[catname]}</a></li>
        {/loop}
        {/pc}
      </ul>
      {/if}
    </li>
    {/loop}
    {/pc}
  </ul>
</div>