如何使用来自FirebaseMessaging的sendToDevice方法的响应来查找给定标记数组中的哪个索引是错误的？

const admin = require('firebase-admin');

admin.initializeApp();

const registrationTokens = ['device_token_1', 'device_token_2', 'device_token_3'];

const message = {
  notification: {
    title: 'New Message',
    body: 'You have a new message'
  },
  tokens: registrationTokens
};

admin.messaging().sendMulticast(message)
  .then((response) => {
    const results = response.responses;
    for (let i = 0; i < results.length; i++) {
      if (!results[i].success) {
        console.log(`Device at index ${i} failed to receive the notification.`);
      }
    }
  })
  .catch((error) => {
    console.log('Error sending notification:', error);
  });