{eval  $catlist=$this->getlistbysql("select id,name,displayorder,grade from ".$this->db->dbprefix."category where iscourse=0 and isuseask=1 and grade=1 and pid=0 order by displayorder desc  limit 0,4");}

                  {loop $catlist $index $cat}

{$topic['title']}{$topic['viewtime']}

                             {/loop}