angular - FCM消息问题

Question

我正在尝试通过遵循此link从FCM生成 token 。我在messaging.service中遇到问题。我无法实现angularFireMessaging.messaging，它在messageing关键字中的拖延错误为

Property 'messaging' does not exist on type 'AngularFireMessaging'

代码

import { Injectable } from '@angular/core';
import { AngularFireMessaging } from '@angular/fire/messaging';
import { BehaviorSubject } from 'rxjs'
@Injectable()
export class MessagingService {
  currentMessage = new BehaviorSubject(null);
  constructor(private angularFireMessaging: AngularFireMessaging) {
    this.angularFireMessaging.messaging.subscribe(  //issue here in messaging
      (_messaging) => {
        _messaging.onMessage = _messaging.onMessage.bind(_messaging);
        _messaging.onTokenRefresh = _messaging.onTokenRefresh.bind(_messaging);
      }
    )
  }
  requestPermission() {
    this.angularFireMessaging.requestToken.subscribe(
      (token) => {
        console.log(token);
      },
      (err) => {
        console.error('Unable to get permission to notify.', err);
      }
    );
  }
  receiveMessage() {
    this.angularFireMessaging.messages.subscribe(
      (payload) => {
        console.log("new message received. ", payload);
        this.currentMessage.next(payload);
      })
  }
}

我要去哪里错了，请帮帮我

Answer 1

我认为回到较旧的版本不是理想的解决方案。
我认为这个问题的作者在跟随教程之后有些过时了。

对于最新版本，

 this.angularFireMessaging.messaging.subscribe(  //issue here in messaging
  (_messaging) => {
    _messaging.onMessage = _messaging.onMessage.bind(_messaging);
    _messaging.onTokenRefresh = _messaging.onTokenRefresh.bind(_messaging);
  }
)

不需要 吗

删除构造函数中的所有内容，并使用以下最新版本更新您的package.json(在编写此答案时)

"@angular/fire": "^6.0.0",
"firebase": "^7.15.1",

它将正常工作。

如果您想了解更多详细信息，请按照此官方教程 https://github.com/angular/angularfire/blob/master/docs/messaging/messaging.md进行操作。