javascript - Google Chrome 中的 Service-Worker 警告

Question

我正在使用 FCM 发送网络通知。我收到此警告，点击通知没有给出通常的结果(打开通知 URL)。这是 Service-Worker 代码

importScripts('https://www.gstatic.com/firebasejs/3.5.2/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/3.5.2/firebase-messaging.js');
firebase.initializeApp({
'messagingSenderId': '<my senderid>'
});

const messaging = firebase.messaging();


messaging.setBackgroundMessageHandler(function(payload) {


  self.addEventListener('notificationclick', function(event) {
    event.notification.close();

    var promise = new Promise(function(resolve) {
      setTimeout(resolve, 1000);
    }).then(function() {
      return clients.openWindow(payload.data.locator);
    });

    event.waitUntil(promise);
  });

  var notificationTitle = payload.data.title;
  var notificationOptions = {
    body: payload.data.body,
    icon: payload.data.icon
  };
  return self.registration.showNotification(notificationTitle,
    notificationOptions);
});

firebase-messaging-sw.js:108 Event handler of 'notificationclick' event must be added on the initial evaluation of worker script.

这是警告信息，108指的是这一行

self.addEventListener('notificationclick', function(event) {

这是在 chrome 版本 55 上。在 Firefox 上，没有任何问题，它运行完全正常。提前致谢。

Answer 1

你应该移动

self.addEventListener 

函数外

messaging.setBackgroundMessageHandler

这样您只需添加一次 EventListener。

您的完整代码应如下所示

const messaging = firebase.messaging();

self.addEventListener('notificationclick', function(event) {
    event.notification.close();

    var promise = new Promise(function(resolve) {
      setTimeout(resolve, 1000);
    }).then(function() {
      return clients.openWindow(event.data.locator);
    });

    event.waitUntil(promise);
  });

messaging.setBackgroundMessageHandler(function(payload) {   

  var notificationTitle = payload.data.title;
  var notificationOptions = {
    body: payload.data.body,
    icon: payload.data.icon,
    locator:payload.data.locator
  };
  return self.registration.showNotification(notificationTitle,
    notificationOptions);
});