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Question

我在一个角度项目上有一个奇怪的错误，这些是代码片段@Injectable()export class FirebaseMessagingService {    public tokenReceivedEmitter: any = new EventEmitter();    public messageReceivedEmitter: any = new EventEmitter();constructor(    private angularFireMessaging: AngularFireMessaging) {    this.angularFireMessaging.messaging.subscribe(        (messaging) => {            messaging.onMessage = messaging.onMessage.bind(messaging);            messaging.onTokenRefresh = messaging.onTokenRefresh.bind(messaging);        }    );}/** * request permission for notification from firebase cloud messaging * * @param userId userId */requestPermission(userId) {    this.angularFireMessaging.requestToken.subscribe(        (token) => {            this.tokenReceivedEmitter.emit({status: true, result: token});        },        (err) => {            this.tokenReceivedEmitter.emit({status: false, result: err});        }    );}/** * hook method when new notification received in foreground */receiveMessage() {    this.angularFireMessaging.messages.subscribe(        (payload) => {            this.messageReceivedEmitter.emit(payload);        });}这就是 firebase 消息服务，它在收到推送通知时发出令牌接收事件。现在在组件中ngOnInit(){    // Subscribing to firebase token receive         this.firebaseTokenSubscription = this.messagingService.tokenReceivedEmitter.subscribe(            (message) => {                if (message.status) {                    const token = message.result;                    this.sendNotificationToken(token);                } else {                    this.snackBar.open(message.result, this.translate.instant('CLOSE')                     {duration:3000});                }        }    );}

Answer 1

问题是 firebase 在 Angular 的视图线程之外请求用户令牌，因此我必须在 Angular 的视图线程中更新模型。

this.ngZone.run(() =>{

     this.user.webPushEnabled = true;

})

它帮助了我。