public function insert()
 {
     $article = new GonggaoModel();
     if ($data = $article->create()) {
         if (false !== $article->add()) {
             $this->message('添加成功', __URL__ . '/index');
         } else {
             $this->message('添加失败:' . $article->getError(), __URL__ . '/add');
         }
     } else {
         $this->message('添加失败:' . $article->getError(), __URL__ . '/add');
     }
 }