code: protected function fetch($template = '', $vars = [], $replace = [], $config = [])
      {
          // 模板文件
          $template || $template = MODULE_VIEW_PATH . \think\Loader::parseName(_CONTROLLER_) . '/' . _ACTION_ . '.html';
          
          return parent::fetch($template, $vars, $replace, $config);
      }
docs: !CodeTemplates.overridecomment.nonjd!
  
  @see \app\common\controller\Root::fetch()