try {
 $instance = Loader::controller(
 $controller,
 $config['url_controller_layer'],
 $config['controller_suffix'],
 $config['empty_controller']
 );
 } catch (ClassNotFoundException $e) {
 throw new HttpException(404, 'controller not exists:' . $e->getClass());
 }

 // 获取当前操作名
 $action = $actionName . $config['action_suffix'];

 $vars = [];
 if (is_callable([$instance, $action])) {
 // 执行操作方法
 $call = [$instance, $action];