在CentOS里更新Flutter，可采用以下方法：
flutter --version。flutter doctor查看。git clone https://github.com/flutter/flutter.git -b stable ~/flutter命令克隆到本地指定目錄。~/.bashrc或~/.zshrc，添加export PATH="$HOME/flutter/bin:$PATH"，然后運行source ~/.bashrc或source ~/.zshrc。flutter --version確認。flutter upgrade命令即可更新到最新版本。
