菜单删除方法

public function delete(){
  $requedt=Request::parm('post.mid');
  $res = $admin_menus::where(array('mid'=>$request))->delete();
  if(!$res){
     exit(json_encode(array('code'=>1,'msg'=>'删除失败')));
  }
  exit(json_encode(array('code'=>0,'msg'=>'删除成功')));
}