public function privilege_bdel(){
  $ids = I('ids');
  $pri = D('privilege');
  $ids = implode(',', $ids);
  if($ids){
   if($pri->delete($ids)){
    $this->success('批量删除栏目成功！',U('Privilege/privilege_lst'));
   }else{
    $this->error('批量删除栏目失败，请重试！');
   }
  }else{
   $this->error('未选中任何内容，请重试！');
  }
 }

public function _before_delete($options){
  //批量删除
  if(is_array($options['where']['id'])){
   $arr = explode(',', $options['where']['id'][1]);
   $sonpri = array();
   foreach ($arr as $k => $v) {
    $sonpri2 = $this->childid($v);
    $sonpri = array_merge($sonpri,$sonpri2);
   }
   $sonpri = array_unique($sonpri);
   $chilrenids = implode(',', $sonpri);
  }else{//单个删除
   $chilrenids =$this->childid($options['where']['id']);
   $chilrenids = implode(',', $chilrenids);
  }
  if($chilrenids){
   $this->execute("delete from ed_privilege where id in($chilrenids)");
  }
 }