正常调用DEDE下拉菜单含二级栏目如下：
{dede:channelartlist typeid='top' currentstyle='on'}
{dede:field name='typename'/}
{dede:channel type='son' noself='yes' currentstyle="~typename~"}
[field:typename/]
{/dede:channel}
{/dede:channelartlist}
判断是否有子栏目：
{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)?'有下级':'没下级';
{/dede:field}
一般上述这种就能解决大部分的问题，但也有特色的导航菜单，就需要判断顶级栏目下有无子栏目，有就显示子栏目，没有就不显示这部分的代码。
实例：
{dede:channelartlist typeid='top'}
<li>
<a href="{dede:field name='typeurl'/}">{dede:field name='typename'/}</a>
{dede:field name=typeid runphp="yes"}
global $dsql; $sql = "SELECT id From `#@__arctype` WHERE reid='@me' And ishidden<>1 order by sortrank asc limit 0, 100 ";
$row = $dsql->GetOne($sql);
@me=is_array($row)?'<div class="navshow">':'';
{/dede:field}
{dede:channel type='son' noself='yes' }
<a href="[field:typelink/]"><img src="[field:typeimg /]"><h2>[field:typename/]</h2></a>
{/dede:channel}
{dede:field name=typeid runphp="yes"}
global $dsql; $sql = "SELECT id From `#@__arctype` WHERE reid='@me' And ishidden<>1 order by sortrank asc limit 0, 100 ";
$row = $dsql->GetOne($sql);
@me=is_array($row)?'</div>':'';
{/dede:field}
</li>
{/dede:channelartlist}
实例效果：
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