如何在Firebase中搜索多个值

var firebase = require('firebase');
// 初始化Firebase应用
// ...

var emails = ['user1@example.com', 'user2@example.com'];
var usersRef = firebase.database().ref('users');

var onValue = usersRef.orderByChild('email').equalTo(emails[0]).on('value', function(snapshot) {
  snapshot.forEach(function(childSnapshot) {
    console.log(childSnapshot.key, childSnapshot.val().email);
  });
});

// 对于多个值，你需要多次调用equalTo()
emails.forEach(function(email) {
  onValue = usersRef.orderByChild('email').equalTo(email).on('value', function(snapshot) {
    snapshot.forEach(function(childSnapshot) {
      console.log(childSnapshot.key, childSnapshot.val().email);
    });
  });
});

var firebase = require('firebase/app');
require('firebase/firestore');
// 初始化Firebase应用
// ...

var emails = ['user1@example.com', 'user2@example.com'];
var usersRef = firebase.firestore().collection('users');

var query = usersRef.where('email', 'in', emails);

query.get().then(function(querySnapshot) {
  querySnapshot.forEach(function(doc) {
    console.log(doc.id, ' => ', doc.data());
  });
}).catch(function(error) {
  console.log("Error getting documents: ", error);
});