TP5 首页导航一级和二级分类

<ul >{$v2.catename}</a>
               {/if}
            </li>
            <?php endforeach; ?>
        </ul>
        {/if}
    </li>
    {/volist}
</ul>

     public function  getNavCates(){
         //获取导航列表及子列表
         $cateres=db('cate')->where('pid',0)->select();
         foreach ($cateres as $k=> $v){
             $children=db('cate')->where('pid',$v['id'])->select();
             if($children){
                 $cateres[$k]['children']=$children;
                // dump($children);die;
             }else{
                 $cateres[$k]['children']=0;
             }
         }
       //  dump($cateres);die;
         $this->assign('cateres',$cateres);
     }