从不显示Firebase Web推送后台消息

我正在我们的web应用程序中使用firebase web推送通知。

当应用程序未处于活动状态或未打开时,从fcm发送的消息将永远不会显示。未生成错误。

前端代码:

<script src="https://www.gstatic.com/firebasejs/5.6.0/firebase.js"></script>
    <script>
        MsgElem = document.getElementById("msg")
        TokenElem = document.getElementById("token")
        NotisElem = document.getElementById("notis")
        ErrElem = document.getElementById("err")
        // Initialize Firebase
        // TODO: Replace with your project's customized code snippet
        var config = {
            apiKey: "<apikey>",
            authDomain: "<app>.firebaseapp.com",
            databaseURL: "https://<DATABASE_NAME>.firebaseio.com",
            storageBucket: "<app>.appspot.com",
            messagingSenderId: "<id>",
        };
        firebase.initializeApp(config);

        const messaging = firebase.messaging();
        messaging
            .requestPermission()
            .then(function () {
                MsgElem.innerHTML = "Notification permission granted." 
                console.log("Notification permission granted.");

                // get the token in the form of promise
                return messaging.getToken()
            })
            .then(function(token) {
                TokenElem.innerHTML = "token is : " + token
            })
            .catch(function (err) {
                ErrElem.innerHTML =  ErrElem.innerHTML + "; " + err
                console.log("Unable to get permission to notify.", err);
            });

        messaging.onMessage(function(payload) {
            console.log("Message received. ", payload);
            NotisElem.innerHTML = NotisElem.innerHTML + JSON.stringify(payload) 
        });
    </script>

firebase-messaging-sw.js网站

    importScripts ('https://www.gstatic.com/firebasejs/5.6.0/firebase-app.js');

    importScripts ('https://www.gstatic.com/firebasejs/5.6.0/firebase-messaging.js');

    firebase.initializeApp ({'messagingSenderId': 'id'});

    const messaging = firebase.messaging();

    messaging.setBackgroundMessageHandler (function(payload) {

    console.log('[firebase-messaging-sw.js] Received background message ', payload);

     const data = payload.data;
     const notificationTitle = data.title;
     const notificationOptions = {
body: data.body
     };

      return self.registration.showNotification (notificationTitle,  notificationOptions);
    });

FCM Request:

 {
      "to":"ids",
      "data":{
      "body":"clicktoaction",
      "title":"Simplext Notification"
      }
    }

无论应用程序是在前台还是后台,始终调用事件messaging.onMessage(函数(有效负载)。

我试着将fcm请求从“data”改为“notification”。还是一样的。

我用的是chrome v 70。