判断是否有下级栏目，有就显示所有下级栏目，没有就显示同级栏目

{dede:channel type='top' row='8' currentstyle="<li><a href='~typelink~' class='thisclass'>~typename~</a> </li>"} 
 <li><a href='[field:typelink/]'>[field:typename/]</a> </li> 
{/dede:channel} 

{dede:channel name='type' runphp='yes' if(reid == "0") @me = "son";else @me = "self";}
<a href='[field:typeurl/]'>[field:typename/]</a>
{/dede:channel}