下载SDK https://flutter.dev/docs/development/tools/sdk/releases
设置环境变量
sudo vim /etc/profile
#复制以下内容，需要替换自己的路径
# 复制开始
export FLUTTER_HOME=/Users/yangle/soft/flutter
export PATH=$PATH:$MAVEN_HOME/bin:$M2_HOME/bin:$FLUTTER_HOME/bin:$FLUTTER_HOME/bin/cache/dart-sdk/bin
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
# 复制结束
# 退出保存，刷新环境变量
source /etc/profile验证环境是否有效
flutter --version
dart --version
