pub中地址：https://pub.flutter-io.cn/packages/hy
运行 dry-run 命令以检验是否所有内容都通过了分析：
flutter pub publish --dry-run发布，请注意：发布是永久性的，运行以下提交命令：
flutter pub publish如果设置了中国镜像即需要用如下命令提交：
flutter packages pub publish --server=https://pub.dartlang.org连接pub服务器失败：
Authorization received, processing...
It looks like accounts.google.com is having some trouble.
Pub will wait for a while before trying to connect again.
OS Error: Operation timed out, errno = 60, address = accounts.google.com, port = 54374
pub finished with exit code 69设置代理：
export https_proxy=http://127.0.0.1:1087
export http_proxy=http://127.0.0.1:1087
set https_proxy=https://127.0.0.1:1087
set http_proxy=http://127.0.0.1:1087