/**
  * 快速引入 css/js/图片
  * @param  string/array $filename 文件名
  * @param string $class 样式名称
  * @return none/boolean
  */
 public function import($filename, $class = '')
 {
     $link = Printemps::parseURL();
     $assetPath = str_replace(APP_ROOT_PATH . '/', "", APP_STATIC_PATH);
     if (!is_array($filename)) {
         $this->importChildren($link, $assetPath, $filename, $class);
     } else {
         foreach ($filename as $value) {
             $this->importChildren($link, $assetPath, $value, $class);
         }
     }
 }