织梦在导航栏下拉菜单中怎么调用当前栏目子类

{dede:channelartlist typeid="top" row='18' currentstyle="<li class='hover'><a href='~typelink~' ~rel~><span>~typename~</span></a></li>"} 
<ul id="navul" class="cl"> 
<!--注意下一行的标签，不是[field:??/]这种，而是{dede:field.??/}这种--> 
<li><a href="{dede:field name="typeurl"/}" target="_blank">{dede:field name="typename"/}</a> 
<ul> 
{dede:channel type="son"} 
<li><a href="[field:typeurl/]" title="HTML">[field:typename/]</a></li> 
{/dede:channel} 
</ul> 
</li> 
</ul> 
{/dede:channelartlist}