我使用FCM来处理推送通知，但通知是在data键而不是notification中。
下面是我用来处理新消息并显示为通知的代码。我看到的通知包含我指定的所有选项和数据。但是，当我单击通知时，它不会触发任何“notificationclick”事件。它也不会打印event.notification。

importScripts('https://www.gstatic.com/firebasejs/5.3.1/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/5.3.1/firebase-messaging.js');

firebase.initializeApp({
    messagingSenderId: "SOME_ID",
});

const messaging = firebase.messaging();

messaging.setBackgroundMessageHandler(payload => {
    console.log(payload);
    const options = {
        body: payload.data.body,
        icon: payload.data.icon,
        click_action: payload.data.click_action,
        link: payload.data.link,
        data: {
            time: new Date(Date.now()).toString(),
            click_action: payload.data.click_action,
        },
    };

    self.registration.showNotification(payload.data.title, options);

});


self.addEventListener("notificationclick", function(event) {
    console.log(event.notification);
    const clickedNotification = event.notification;
    clickedNotification.close();

    const urlToOpen = clickedNotification.data && clickedNotification.data.click_action;

    const promiseChain =  clients.matchAll({
        type: 'window',
        includeUncontrolled: true,
    })
        .then((windowClients) => {
            let matchingClient = null;

            for (let i = 0; i < windowClients.length; i++) {
                const windowClient = windowClients[i];
                if (windowClient.url === urlToOpen) {
                    matchingClient = windowClient;
                    break;
                }
            }

            if (matchingClient) {
                return matchingClient.focus();
            } else {
                return clients.openWindow(urlToOpen);
            }
        });

    event.waitUntil(promiseChain);

});