flutter 安装库总是失败 flutter packages get

参考页面：https://www.jianshu.com/p/147f0e20c312

flutter安装库  flutter packages get

一直安装不上，时间又很长

Running "flutter packages get" in project_name...

mac、linux上解决方案：

　　在环境变量中添加以下：

　　

export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

　　windows的我没试过

PUB_HOSTED_URL ===== https://pub.flutter-io.cn
FLUTTER_STORAGE_BASE_URL ===== https://storage.flutter-io.cn

下载成功后会出现   Process finished with exit code 0

我保存后依然没有效果，重启就好了