javascript推送通知的云功能

const functiOns= require(&＃39;firebase-functions&＃39;);
const admin = require(&＃39;firebase-admin&＃39;);
admin.initializeApp(functions.config().firebase);
/**
* Triggers when new subject added in the list and sends a notification.
*/
exports.sendNotification = functions.database.ref(&＃39;/subjects/{subjectKey}&＃39;).onWrite((event) => {
// Grab the current value of what was written to the Realtime Database.
const subject = event.data.val();
// Notification details.
const payload = {
notification: {
title: &＃39;hello&＃39;,
body: `${subject.author} just posted new subject "${subject.title}".`,
icon: &＃39;photoURL&＃39;,
sound: &＃39;default&＃39;,
clickAction: &＃39;fcm.ACTION.HELLO&＃39;,
// badge: &＃39;1&＃39;
},
data: {
extra: &＃39;extra_data&＃39;,
},
};
// Set the message as high priority and have it expire after 24 hours.
const optiOns= {
collapseKey: &＃39;demo&＃39;,
contentAvailable: true,
priority: &＃39;high&＃39;,
timeToLive: 60 * 60 * 24,
};
// Send a message to devices subscribed to the provided topic.
const topic = `/topics/list`;
return admin.messaging().sendToTopic(topic, payload, options)
.then((response) => {
console.log(&＃39;Successfully sent message:&＃39;, response);
});
});