var config = {
    apiKey: "XX",authDomain: "XX",databaseURL: "XX",storageBucket: "XX",messagingSenderId: "XX"
};
firebase.initializeApp(config);

const messaging = firebase.messaging();

messaging.requestPermission()
.then(function() {
    console.log('Notification permission granted.');
    messaging.getToken()
    .then(function(currentToken) {
        if (currentToken) {
            console.log(currentToken);
        } else {
            console.log('No Instance ID token available. Request permission to generate one.');
        }
    })
    .catch(function(err) {
        console.log('An error occurred while retrieving token. ',err);
    });
})
.catch(function(err) {
    console.log('Unable to get permission to notify. ',err);
});

奇怪的是,从不调用messaging.getToken()的then函数.控制台确实显示授予的通知权限,但在此之后,它保持安静(即我也没有收到任何错误).

难道我做错了什么？

编辑：应该注意的是,我正在尝试在Chrome扩展程序中实现此功能.