/**
  * 彻底删除
  * @param int $id
  */
 public function del($id = 0)
 {
     $PostsLogic = new PostsLogic();
     if ($PostsLogic->del($id)) {
         $this->success('永久删除成功');
     } else {
         $this->error('永久删除失败');
     }
 }