您还可以从 BoxElementsRepository 获取数据或输出任何您喜欢的内容
class MainController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController {
   protected $boxElementsRepository;
   public function injectBoxElementsRepository(BoxElementsRepository $boxElementsRepository) {
        $this->boxElementsRepository = $boxElementsRepository;
   }
   public function AddBoxesAction(){
        $popupBoxActionOutput = $this->boxElementsRepository->popupBox();
        $addBoxesAction = $this->mainRepository->findAll();
        $this->view->assignMultiple(array(
            'popupBoxActionOutput' => $popupBoxActionOutput,
            'addBoxesAction' => $addBoxesAction,
    ));
   }
}