protected function display($templateFile = '', $charset = '', $contentType = '', $content = '', $prefix = '')
 {
     if (!$templateFile) {
         $templateFile = strtolower(CONTROLLER_NAME . '/' . ACTION_NAME);
     }
     // TODO white_list 数据库得出可以显示的CONTROLLER_NAME
     if ($this->iswap) {
         $templateFile = 'wap/' . $templateFile;
     }
     parent::display($templateFile);
 }