Firebase，requestPermission；未捕获的SyntaxError:网络云消息传递中的意外标记

Question

我刚刚开始使用Firebase Web Cloud Messaging，偶然发现了一个无法继续的问题。

云消息传递与Tizen Web应用程序(三星设备应用程序)集成，目标是使用云消息传递和接收消息。

控制台在.html文件中的一行显示“未捕获的SyntaxError:意外的令牌”。

这里是代码停止/故障的地方: return.messaging.getToken()；

我需要如何解决这个问题？

我试着使用这个Firebase link (这个链接链接到文档的第一页)

包含此部分并将其写入.html

</body>
<!-- The core Firebase JS SDK is always required and must be listed first         -->
<
<script src="https://www.gstatic.com/firebasejs/6.4.0/firebase-app.js">               </script>

<!-- <script src="/__/firebase/6.4.0/firebase.js"></script> -->

<script
    src="https://www.gstatic.com/firebasejs/6.4.0/firebase-messaging.js">         </script>

<!-- TODO: Add SDKs for Firebase products that you want to use
     https://firebase.google.com/docs/web/setup#config-web-app -->

<script>
  // Your web app's Firebase configuration
  var firebaseConfig = {
    apiKey: "confidential information",
    authDomain: "confidential information",
    databaseURL: "confidential information",
    projectId: "confidential information",
    storageBucket: "",
    messagingSenderId: "confidential information",
    appId: "confidential information"
  };
  // Initialize Firebase
  firebase.initializeApp(firebaseConfig);

  const messaging = firebase.messaging();

  messaging.usePublicVapidKey('!token!');


  messaging.requestPermission()
  .then(function() {
        console.log('Have Permission');
    return.messaging.getToken();
  })
  .then(function(token) {
    console.log(token);
  })
  .catch(function(err) {
  console.log('Error Occured.')


  messaging.onMessage(function(payload) {
    console.log('onMessage: ', payload);
  });
</script>

</html>

必须包含在应用程序包中的.js文件

文件名: firebase-messaging-sw.js

importScripts('https://www.gstatic.com/firebasejs/6.4.0/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/6.4.0/firebase-       messaging.js');

// Your web app's Firebase configuration
var firebaseConfig = {
apiKey : "confidential information",
authDomain : "confidential information",
databaseURL : "confidential information",
projectId : "confidential information",
storageBucket : "",
messagingSenderId : "confidential information",
appId : "confidential information"
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);

const
messagin = firebase.messaging();
messaging.setBackgroundMessageHandler(function(payload) {
    const
    title = "Hello World";
    const
    options = {
        body : payload.data.status
    };
    // normal web browser api in displaying notifications
    return self.registration.showNotification();
});

Answer 1

请参见：

• https://firebase.google.com/support/release-notes/js#cloud-messaging
• https://developer.mozilla.org/ja/docs/Web/API/notification/requestPermission

不推荐使用requestPermission()。改用本机浏览器应用编程接口Notification.requestPermission()。

在任何情况下，请尝试使用Notification.requestPermission()。