本文介绍了无法在应用程序中接收通知并获取错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我的代码在此回购中： https://github.com/akash07k/Clouding.git 因此，我无法在我的应用程序中接收通知。 当我向应用程序发送通知时，控制台中出现以下错误：
fcmregistrations.goo…45qFPDOp7C-LYs1JN:1 Failed to load resource: the server responded with a status of 404 ()
Warning
token-manager.ts:67 FirebaseError: Messaging: A problem occurred while unsubscribing the user from FCM: FirebaseError: Messaging: A problem occurred while unsubscribing the user from FCM: Requested entity was not found. (messaging/token-unsubscribe-failed). (messaging/token-unsubscribe-failed).
at requestDeleteToken (requests.ts:143)
at async getTokenInternal (token-manager.ts:61)
推荐答案
从前面的question上下文中，我建议将页面通知权限设置为默认并请求一个全新的令牌。还要确保使用您的vapidKey。但你已经写过你这么做了。这里可能出现的问题是，您仍然拥有来自WRINGvapidKey的token，因此您没有获得从您的应用程序向该令牌发送的权限。
使用此代码，它应该可以工作： 您可以在底部看到收到的消息。
html文件：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Clouding</title>
<script type="module">
// Import the functions you need from the SDKs you need
import { initializeApp } from "https://www.gstatic.com/firebasejs/9.0.2/firebase-app.js";
import { getAnalytics } from "https://www.gstatic.com/firebasejs/9.0.2/firebase-analytics.js";
import { getMessaging, getToken, onMessage } from "https://www.gstatic.com/firebasejs/9.0.2/firebase-messaging.js";
// TODO: Add SDKs for Firebase products that you want to use
// https://firebase.google.com/docs/web/setup#available-libraries
// Your web app's Firebase configuration
// For Firebase JS SDK v7.20.0 and later, measurementId is optional
//CHANGE HERE
const firebaseConfig = {
apiKey: "AIzaSyCADVGUqs4tNdem8OMOhDO0i3G0wjQiCB4",
authDomain: "extension-tester.firebaseapp.com",
databaseURL: "https://extension-tester.firebaseio.com",
projectId: "extension-tester",
storageBucket: "extension-tester.appspot.com",
messagingSenderId: "230563136927",
appId: "1:230563136927:web:4c789d9b12e93317cf69aa"
};
window.addEventListener("click", (e) => {
switch (e.target.id) {
case "btnPermissions":
initFirebaseMessagingRegistration();
break;
}
});
// Initialize Firebase
const app = initializeApp(firebaseConfig);
// const analytics = getAnalytics(app);
const messaging = getMessaging(app);
function initFirebaseMessagingRegistration() {
// Don't forget your vapidKey here
// CHANGE HERE
getToken(messaging, { vapidKey: "BAqU95FyfIh8ikX7gecF3fTd6vyrXpS2JU8Urvr8KpNFyzFOiiR2dHCy_TJHftplF-pXvM7ERbNkwczszx4PNPs" })
.then((t) => {
tokenElement.innerHTML = "Token is " + t;
})
.catch(function (err) {
errorElement.innerHTML = "Error: " + err;
console.log("Didn't get notification permission", err);
});
onMessage(messaging, (payload) => {
console.log("Message received. ", JSON.stringify(payload));
notificationElement.innerHTML =
notificationElement.innerHTML + " " + payload.data.notification;
});
}
</script>
</head>
<body>
<main>
<h1>Welcome to Clouding</h1>
<div id="token" style="color:lightblue" role="alert"></div>
<div id="message" style="color:lightblue" role="alert"></div>
<div id="notification" style="color:green" role="alert"></div>
<div id="error" style="color:red" role="alert"></div>
<script>
messageElement = document.getElementById("message")
tokenElement = document.getElementById("token")
notificationElement = document.getElementById("notification")
errorElement = document.getElementById("error")
</script>
<button id="btnPermissions">Enable Firebase Messaging</button>
</main>
</body>
</html>
firebase-messaging-sw.js文件：
// 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/9.0.1/firebase-app-compat.js"
);
importScripts(
"https://www.gstatic.com/firebasejs/9.0.1/firebase-messaging-compat.js"
);
// Initialize the Firebase app in the service worker by passing in
// your app's Firebase config object.
// https://firebase.google.com/docs/web/setup#config-object
//CHANGE HERE
firebase.initializeApp({
apiKey: "AIzaSyCADVGUqs4tNdem8OMOhDO0i3G0wjQiCB4",
authDomain: "extension-tester.firebaseapp.com",
databaseURL: "https://extension-tester.firebaseio.com",
projectId: "extension-tester",
storageBucket: "extension-tester.appspot.com",
messagingSenderId: "230563136927",
appId: "1:230563136927:web:4c789d9b12e93317cf69aa",
});
// Retrieve an instance of Firebase Messaging so that it can handle background
// messages.
const messaging = firebase.messaging();
// If you would like to customize notifications that are received in the
// background (Web app is closed or not in browser focus) then you should
// implement this optional method.
// Keep in mind that FCM will still show notification messages automatically
// and you should use data messages for custom notifications.
// For more info see:
// https://firebase.google.com/docs/cloud-messaging/concept-options
messaging.onBackgroundMessage(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",
};
self.registration.showNotification(notificationTitle, notificationOptions);
});
vapiKey中的Firebase配置。然后删除您托管项目的通知的所有权限。
注销Curren Firebase软件，因为它可能已损坏和卡住：
也请使用serve进行本地托管。之后，打开您的侧面，按下按钮并将令牌复制到此处：
发送邮件后，您将看不到通知，因为我们正在以y自定义方式处理它，所以您只会看到第一张图片中所示的日志。
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