Node.js 如何在云函数中传递动态引用？

我想使用云功能为特定用户发送推送通知

这是我的密码：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.sendPushNotification = functions.database.ref('/Users/{id}').onWrite(event => {
const payload = {
    notification: {
        title: 'Test message',
        body: 'Hope you are fine',
        badge: '1',
        sound: 'default',
    }
};

return admin.database().ref('fcmToken').once('value').then(allToken => {
    if(allToken.val()){
        const token = Object.keys(allToken.val());
        return admin.messaging().sendToDevice(token, payload).then(response => {

        });
    }
});
});

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.sendPushNotification = functions.database.ref('/Users/{id}').onWrite(event => {

var eventSnapshot = event.data;
    var particularUser = eventSnapshot.child('City');
    if (particularUser.changed()) {
      const payload = {
              notification: {
                  title: 'Test message',
                  body: 'Hope you are fine',
                  badge: '1',
                  sound: 'default',
              }
          };

          var getToken = eventSnapshot.child('fcmToken');

                  const token = Object.keys(getToken.val());
                  return admin.messaging().sendToDevice(token, payload).then(response => {

                  });

    }


});

但是，如何动态地执行，也就是说，我想为特定用户发送推送通知，这段代码将通知发送给所有注册的用户。因此，请帮助我将静态id（db引用）更改为动态id（db引用），以及如何在此代码行中传递不同的通知内容：

const payload = {
    notification: {
        title: 'Test message',
        body: 'Hope you are fine',
        badge: '1',
        sound: 'default',
    }
};

---

有人在这方面指导我吗？

我是动态实现的。希望它能帮助别人

这是我的密码：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.sendPushNotification = functions.database.ref('/Users/{id}').onWrite(event => {
const payload = {
    notification: {
        title: 'Test message',
        body: 'Hope you are fine',
        badge: '1',
        sound: 'default',
    }
};

return admin.database().ref('fcmToken').once('value').then(allToken => {
    if(allToken.val()){
        const token = Object.keys(allToken.val());
        return admin.messaging().sendToDevice(token, payload).then(response => {

        });
    }
});
});

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.sendPushNotification = functions.database.ref('/Users/{id}').onWrite(event => {

var eventSnapshot = event.data;
    var particularUser = eventSnapshot.child('City');
    if (particularUser.changed()) {
      const payload = {
              notification: {
                  title: 'Test message',
                  body: 'Hope you are fine',
                  badge: '1',
                  sound: 'default',
              }
          };

          var getToken = eventSnapshot.child('fcmToken');

                  const token = Object.keys(getToken.val());
                  return admin.messaging().sendToDevice(token, payload).then(response => {

                  });

    }


});

若要更改通知内容，可以在从应用程序端更新后从数据库中获取