Firebase 客户端 SDK(适用于 Android、iOS 和 Web)旨在用于最终用户应用程序.它们只允许您一次注册一个用户，该用户会立即登录.

The Firebase client SDKs (for Android, iOS and Web) are meant to be used in end-user applications. They only allow you to register a single user at once, and that user is immediately signed in.

要一次注册多个用户，请考虑使用:

To register multiple users at once, consider using:

• Firebase Admin SDK，其中身份验证功能目前仅在 Node.js 中可用.

• the Firebase Admin SDK, for which the Authentication functionality is only available in Node.js at the moment.

Firebase 命令行工具的 auth:import 命令.

the auth:import command of the Firebase command line tools.