需要事先安装homebrew：ruby -e "$(curl -fsSL --insecure raw.githubusercontent.com/Homebrew/in…)"
其他的搭建过程看隔壁的文章：https://www.jianshu.com/p/b50a92afbef1
https://flutterchina.club/setup-macos/#%E5%AE%89%E8%A3%85-xcode
https://flutterchina.club/get-started/test-drive/
完毕后，来一个最佳实践》hello world
https://segmentfault.com/a/1190000016602108
