因此，我尝试通过Firebase上的功能发送通知。
我正在通过Node.js在JavaScript上进行通知编程。
从一个帐户单击Send Friend Request时，另一个人应该收到我在下面附加的JavaScript文件的有效负载上指定的通知。
我的Firebase函数上不断出现以下错误
ReferenceError：事件未定义。
这里是确切错误的image。
这是我的JavaScript文件：
/*
* Functions SDK : is required to work with firebase functions.
* Admin SDK : is required to send Notification using functions.
*/
//This runs JavaScript in Strict Mode, which prevents the use of things such as undefined variables.
'use strict'
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
/*
* 'OnWrite' works as 'addValueEventListener' for android. It will fire the function
* everytime there is some item added, removed or changed from the provided 'database.ref'
* 'sendNotification' is the name of the function, which can be changed according to
* your requirement
*/
exports.sendNotification = functions.database.ref('/Notifications/{retrieveUserId}/{notificationId}').onWrite((data, context) => {
/*
* You can store values as variables from the 'database.ref'
* Just like here, I've done for 'user_id' and 'notification'
*/
const retrieveUserId = context.params.retrieveUserId;
const notificationId = context.params.notificationId;
console.log('User id is : ', retrieveUserId);
//Prevents notification being sent if there are no logs of notifications in the database.
if (!event.data.val()) {
return console.log('A notification has been deleted from the database : ', notificationId);
}
const deviceToken = admin.database().ref(`/Users/${retrieveUserId}/device_token`).once('value');
return deviceToken.then(result => {
const tokenId = result.val();
const payload = {
notification: {
title: "Friend Request",
body: "You have received a friend request from Slim Shady",
icon: "default"
}
};
return admin.messaging().sendToDevice(tokenId, payload).then(response => {
return console.log('Notification was sent to the user');
});
});
});
这是JavaScript文件中所指的Firebase数据库的picture个父母和子女。
由于错误指出未定义事件，因此我试图找出未定义的事件。
这是什么问题？
