Javascript 将Firebase与我的Web应用程序集成以发送通知

我被firebase困住了，任何帮助都将不胜感激。 我的目标是，无论谁打开我的页面，都会收到允许/阻止的通知。无论谁允许通知，我都想在未来的云消息应用程序中向他发送通知

我已经取得了一些成就，当我通过https打开我的网页时，我收到了我想允许还是不允许的通知

在我允许之后，当我尝试通过云向项目的所有参与者发送消息时，我什么也得不到

首先，我设置firebase配置

<script>
  // Your web app's Firebase configuration 
  var config = {
    apiKey: "AIzaSyDX5nRZCEI-wxp7L7TzI3lYQXlFlIZq7Rw",
    authDomain: "braintech-6f3cf.firebaseapp.com",
    databaseURL: "https://xxxx.firebaseio.com",
    projectId: "braintech-6f3cf",
    storageBucket: "",
    messagingSenderId: "xxxx",
    appId: "1:747770571255:web:da58976e57ebeb0835a6f2",
    measurementId: "G-73HKECM57P"
  };
  // Initialize Firebase
  firebase.initializeApp(config); 
  // Retrieve Firebase Messaging object.

const messaging = firebase.messaging();
 function setTokenSentToServer(sent) {
window.localStorage.setItem('sentToServer', sent ? '1' : '0');
}

function sendTokenToServer(currentToken) {
    if (!isTokenSentToServer()) {
      console.log('Sending token to server...');
      // TODO(developer): Send the current token to your server. 
      setTokenSentToServer(true);
    } else {
      console.log('Token already sent to server so won\'t send it again ' +
          'unless it changes');
    }
} 

function isTokenSentToServer() {
    return window.localStorage.getItem('sentToServer') === '1';
  }
function getRegisterToken(){
  // Get Instance ID token. Initially this makes a network call, once retrieved
// subsequent calls to getToken will return from cache.
messaging.getToken().then((currentToken) => {
  if (currentToken) {
    sendTokenToServer(currentToken);

    console.log(currentToken);
    updateUIForPushEnabled(currentToken);
  } else {
    // Show permission request.
    console.log('No Instance ID token available. Request permission to generate one.');
    // Show permission UI.
    updateUIForPushPermissionRequired();
    setTokenSentToServer(false);
  }
}).catch((err) => {
  console.log('An error occurred while retrieving token. ', err);
  showToken('Error retrieving Instance ID token. ', err);
  setTokenSentToServer(false);
});  
}
function showToken(currentToken) {
    // Show token in console and UI.
    const tokenElement = document.querySelector('#token');
    tokenElement.textContent = currentToken;
  }

不知道怎么了？任何帮助都将不胜感激

// Give the service worker access to Firebase Messaging.
// Note that you can only use Firebase Messaging here, other Firebase libraries
// are not available in the service worker.
importScripts('https://www.gstatic.com/firebasejs/6.3.4/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/6.3.4/firebase-messaging.js');

// Initialize the Firebase app in the service worker by passing in the
// messagingSenderId.
  var config = {
    apiKey: "AIzaSyDX5nRZCEI-wxp7L7TzI3lYQXlFlIZq7Rw",
    authDomain: "xxxx.firebaseapp.com",
    databaseURL: "https://xxx.firebaseio.com",
    projectId: "xxx",
    storageBucket: "",
    messagingSenderId: "xxxx",
    appId: "1:747770571255:web:da58976e57ebeb0835a6f2",
    measurementId: "G-73HKECM57P"
  };
  // Initialize Firebase
  firebase.initializeApp(config); 
  // Retrieve Firebase Messaging object.

// Retrieve an instance of Firebase Messaging so that it can handle background
// messages. 
const messaging = firebase.messaging();

messaging.setBackgroundMessageHandler(function(payload) {
  console.log('[firebase-messaging-sw.js] Received background message ', payload);
  // Customize notification here
  const notificationTitle = 'Background Message Title';
  const notificationOptions = {
    body: 'Background Message body.',
    icon: '/firebase-logo.png'
  };

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