环境配置
flutter，根据官网更新，（https://docs.flutter.dev/community/china）镜像配置。mac中的`.bash_profile`配置：
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
下载sdk，并且配置环境变量
export PATH=$PATH:/Users/kakadai/Documents/flutter/bin
as中在plugins中安装flutter和dart
检查：
flutter doctor
学习资料
谷歌安卓开发者网页镜像访问：
https://developer.android.google.cn/
资料：
book.flutterchina.club
https://juejin.cn/post/6844903850076291086
https://juejin.cn/post/6938687202184396836
dart在线练习
https://dartpad.cn/?
学习demo
https://github.com/iampawan/FlutterExampleApps
JSON to Dart 工具：
https://javiercbk.github.io/json_to_dart/
pub库相关
输入一下代码，升级插件:
flutter pub upgrade --major-versions
package repository for Dart and Flutter apps:
https://pub.dev/
