如果浏览器在后台，FCM 推送通知会到达两次
我已经建立了一个简单的推送通知站点，如果浏览器在前台，通知就可以到达.
I've set up a simple push notification site, the notifications arrive okay if the browser is in foreground.
如果浏览器在后台，问题就开始了:通知到达两次，一次设置了图像样式和其他设置，另一次只有标题和正文消息.
The problem begins if the browser is in background: the notification arrives twice, one styled with image and other settings set and the other has only title and body message.
Service Worker 的内容:
Content of the service worker:
importScripts('https://www.gstatic.com/firebasejs/3.5.2/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/3.5.2/firebase-messaging.js');
// Initialize the Firebase app in the service worker by passing in the
// messagingSenderId.
firebase.initializeApp({
'messagingSenderId': '...'
});
const messaging = firebase.messaging();
messaging.setBackgroundMessageHandler(function(payload) {
console.log('[firebase-messaging-sw.js] Received background message ',
return null;
});
self.addEventListener('install', function (event) {
event.waitUntil(skipWaiting());
});
self.addEventListener('activate', function (event) {
event.waitUntil(clients.claim());
});
self.addEventListener('push', function (event) {
var pushData = event.data.json();
try {
var notificationData = pushData.data;
notificationData.data = JSON.parse(notificationData.data);
console.log(notificationData);
self.registration.showNotification(pushData.notification.title, notificationData);
}
catch (err) {
console.log('Push error happened: ', err);
}
});
客户端js:
firebase.initializeApp(firebaseConfig);
const messaging = firebase.messaging();
messaging.onMessage(function (payload) {
console.log("notification recieved");
return null;
});
self.addEventListener('push', function (event) {
console.log("window push stuff");
return null;
});
谢谢！
推荐答案
在 messaging.setBackgroundMessageHandler 事件中加入这一行即可解决问题:
The problem can be solved with adding this line to the messaging.setBackgroundMessageHandler event:
self.registration.hideNotification();
这样，默认通知将不会显示，您必须在 self.addEventListener 事件中显示您的通知.
This way, the default notification won't show and you have to show your notification in the self.addEventListener event.
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