说明class="dropdown"//dropdown样式出现，class=""没样式。
{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)?'class="dropdown"':'class=""';{/dede:field}

class="{dede:field name=typeid runphp='yes'}(@me=='')? @me='current':@me='';{/dede:field}"