1. firebase 对象的初始化已针对旧版本完成，请参阅此 https://firebase.google.com/docs/web/setup ，它使用 firebase.initializeApp(config) 而不是 new firebase()

1. Initialization of firebase object was done for the old version, see this https://firebase.google.com/docs/web/setup , it uses firebase.initializeApp(config) instead of new firebase()

使用此代码更新您的数据库与用户的附加字段

to update your database with user's additional fields use this code

firebase.database().ref('users/' + user.uid).set({
    firstName: firstName,
    lastName: lastName
})