A new Flutter project.
This project is a starting point for a Flutter application.
A few resources to get you started if this is your first Flutter project:
For help getting started with Flutter development, view the online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.
https://socket.io/zh-CN/docs/v4/client-installation/
客户端和服务端版本存在兼容性