yarn安装报错【There appears to be trouble with your network connection. Retrying...】

检查配置文件：yarn config list

更新配置文件：

yarn config set registry https://registry.npm.taobao.org

npm config set registry https://registry.npm.taobao.org

npm config set disturl https://npm.taobao.org/dist

npm config set https://registry.npmjs.org/

然后  出现：error An unexpected error occurred

执行：yarn config set strict-ssl false -g

解决，可以更新yarn了，附：

删除无用配置项：

yarn config delete 配置项名

npm config delete 配置项名