public function delete()
 {
     $id = I('id');
     $model = new ReplyModel();
     $post = $model->find($id);
     if (empty($post)) {
         $this->error('回复不存在');
     }
     $result = $model->delete($id);
     if ($result === false) {
         $this->error('删除失败');
     } else {
         $this->success('删除成功');
     }
 }
 /**
  * 删除回复
  */
 public function replyDelete()
 {
     $this->checkLogin();
     $id = I('id');
     $model = new ReplyModel();
     $post = $model->find($id);
     if (empty($post)) {
         $this->error('回复不存在');
     }
     if ($post['userId'] != $this->user['userId']) {
         $this->error('你无权删除');
     }
     $result = $model->delete($id);
     if ($result === false) {
         $this->error('删除失败');
     } else {
         $callback = I('callback');
         if (empty($callback)) {
             $callback = U('replies');
         }
         $this->success('删除成功', $callback);
     }
 }