这是我的服务工作者文件，显示推送通知：
importScripts('https://www.gstatic.com/firebasejs/3.5.0/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/3.5.0/firebase-messaging.js');
var config = {
apiKey: "my_key",
authDomain: "my_domain.firebaseapp.com",
databaseURL: "https://my_db.firebaseio.com",
storageBucket: "my_bucket.appspot.com",
messagingSenderId: "my_sender_id"
};
firebase.initializeApp(config);
var messaging = firebase.messaging();
messaging.setBackgroundMessageHandler(function (payload) {
var notificationTitle = 'Hello World';
var notificationOptions = {
body: 'Test push notification'
};
return self.registration.showNotification(notificationTitle,notificationOptions);
});
这是我的html，它注册了服务工作者：
<!DOCTYPE html>
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div>TODO write content</div>
<script src="https://www.gstatic.com/firebasejs/3.5.0/firebase.js"></script>
<script>
var config = {
apiKey: "my_key",
authDomain: "my_domain.firebaseapp.com",
databaseURL: "https://my_db.firebaseio.com",
storageBucket: "my_bucket.appspot.com",
messagingSenderId: "my_sender_id"
};
firebase.initializeApp(config);
</script>
<script>
var messaging = firebase.messaging();
var ser = '/serviceworker.js';
if ('serviceWorker' in navigator) {
// Register service worker
navigator.serviceWorker.register('./public/serviceworker.js').then(function (reg) {
messaging.useServiceWorker(reg);
messaging.requestPermission()
.then(function () {
console.log('Notification permission granted.');
return messaging.getToken()
.then(function (currentToken) {
if (currentToken) {
console.log('in if', currentToken);
if (window.XMLHttpRequest) {
xhttp = new XMLHttpRequest();
} else {
xhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
}
};
xhttp.open("POST", "/notification", true);
xhttp.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
xhttp.send(JSON.stringify({token: currentToken}));
} else {
console.log('in else', currentToken);
}
}).catch(function (err) {
console.log('An error occurred while retrieving token. ', err);
});
})
.catch(function (err) {
console.log('Unable to get permission to notify. ', err);
});
messaging.onMessage(function (payload) {
var options = {
body: payload.data.body
}
var notificationObj = new Notification(payload.data.title, options);
});
}).catch(function (err) {
console.error("SW registration failed with error " + err);
});
}
</script>
</body>
</html>
一切正常，但是当我第一次加载页面时，我在允许通知权限后看到以下错误。我正在使用FCM进行推送通知。
Service worker event waitUntil() was passed a promise that rejected with 'TypeError: b is null'.