今天，我遇到了一個(gè)問題，即在符號(hào)上使用KnpSnappyBundle生成PDF。我正在使用AJAX運(yùn)行路由，代碼工作正常，但它不會(huì)生成PDF，我想在這里完成的是在新的選項(xiàng)卡或窗口中生成PDF，并向客戶端返回成功的消息。這是我的代碼： /** * @Route("/api/release_bills/{month}/{year}/{region}", name="api_print_bills", methods={"GET","POST"}) * @param BillRepository $billRepository * @param ConsumptionRepository $consumptionRepository * @param Request $request * @param Snappy $snappy * @param $month * @param $year * @param $region * @return Response * @throws Exception */public function releaseBills(BillRepository $billRepository,ConsumptionRepository $consumptionRepository, Request $request, Snappy $snappy,  $month,$year,$region ): Response{    $error = array();    $success = array();    if( $month>0 && $month<13 || preg_match("/^\d{4}$/",$year)||$region!=''){        if($year>=2018 && $year <=2050){            $entityManager = $this->getDoctrine()->getManager();                $bills = $consumptionRepository->findAllWaterMetersForBilling($month,$year,$region);                $isBillsExisted = $billRepository->findAllBillsByDate($month,$year,$region);                if(empty($bills)){                    array_push($error,['error'=>'there is not bills to be release for this criteria : [ city: '.$region.', year :'.$year.', and Month : '.$month.'!]']);                    return new JsonResponse($error);                }                $arr = array();                $newBills = array();                $billsEnd=end($bills);                foreach ($bills as $key=>$b){                    $wmNumber =  $b->getWaterMeter()->getWmNumber();                    $fullName = $b->getWaterMeter()->getClient()->getFullName();                    $cin = $b->getWaterMeter()->getClient()->getCin();                    $address= $b->getWaterMeter()->getAddress();                    $wmAddress = $b->getWaterMeter()->getAddress()->getStreetAddress();                    $city = $b->getWaterMeter()->getAddress()->getCity();