我正在阅读这篇文章（不幸的是它并不完整），尝试学习如何将Ionic 3基于PWA的应用程序与Firebase云消息传递进行集成：使用FCM推送通知
我所做的：
- 按照文章中的建议，在service-worker.js中添加了FCM库：
'use strict';
importScripts('./build/sw-toolbox.js');
importScripts('https://www.gstatic.com/firebasejs/4.9.0/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/4.9.0/firebase-messaging');
firebase.initializeApp({
// get this from Firebase console, Cloud messaging section
'messagingSenderId': '47286327412'
});
const messaging = firebase.messaging();
messaging.setBackgroundMessageHandler((payload) => {
console.log('Received background message ', payload);
// here you can override some options describing what's in the message;
// however, the actual content will come from the service sending messages
const notificationOptions = {
icon: '/assets/img/appicon.png'
};
return self.registration.showNotification(notificationTitle, notificationOptions);
});
self.toolbox.options.cache = {
name: 'ionic-cache'
};
// pre-cache our key assets
self.toolbox.precache(
[
'./build/main.js',
'./build/vendor.js',
'./build/main.css',
'./build/polyfills.js',
'index.html',
'manifest.json'
]
);
// dynamically cache any other local assets
self.toolbox.router.any('/*', self.toolbox.cacheFirst);
// for any other requests go to the network, cache,
// and then only use that cached resource if your user goes offline
self.toolbox.router.default = self.toolbox.networkFirst;import { Injectable } from "@angular/core";
import * as firebase from 'firebase';
import { Storage } from '@ionic/storage';
@Injectable()
export class FirebaseMessagingProvider {
private messaging: firebase.messaging.Messaging;
private unsubscribeOnTokenRefresh = () => {};
constructor(
private storage: Storage
) {
this.messaging = firebase.messaging();
}
public enableNotifications() {
console.log('Requesting permission...');
return this.messaging.requestPermission().then(() => {
console.log('Permission granted');
// token might change - we need to listen for changes to it and update it
this.setupOnTokenRefresh();
return this.updateToken();
});
}
public disableNotifications() {
this.unsubscribeOnTokenRefresh();
this.unsubscribeOnTokenRefresh = () => {};
return this.storage.set('fcmToken','').then();
}
private updateToken() {
return this.messaging.getToken().then((currentToken) => {
if (currentToken) {
// we've got the token from Firebase, now let's store it in the database
return this.storage.set('fcmToken', currentToken);
} else {
console.log('No Instance ID token available. Request permission to generate one.');
}
});
}
private setupOnTokenRefresh(): void {
this.unsubscribeOnTokenRefresh = this.messaging.onTokenRefresh(() => {
console.log("Token refreshed");
this.storage.set('fcmToken','').then(() => { this.updateToken(); });
});
}
}现在，在应用程序初始化期间，我调用enableNotifications()，但是出现了错误，提示默认服务工作者未找到（404）：
在获取脚本时收到了不良的HTTP响应代码（404）。 :8100/firebase-messaging-sw.js Failed to load resource: net::ERR_INVALID_RESPONSE
如果我将service-worker.js中的Firebase相关内容移动到WWW文件夹中的默认服务工作者中，则会从Firebase收到一般性错误（错误，无法注册服务工作者）。
问题： - 是否有关于Ionic 3的PWA和FCM的最新指南？ - 在高层次上，Ionic 3与Angular中注册服务工作者的区别是什么？我看过有关Angular的教程，但不知道如何在Ionic 3中进行相同操作。
