/**
  * 
  * 删除分类
  */
 public function delCate()
 {
     if (is_numeric($id = I('id', '', 'intval')) || is_array($id = I('id'))) {
         $PS = new PaperService();
         $res = $PS->deleteCates($id);
     }
     if ($res === true) {
         redirect(U('Cates/index'));
         die;
     } else {
         $this->error($res, U('Cates/index'), 2);
     }
 }