There appears to be trouble with your network connection.Retrying

yarn 下包的时候提示错误：There appears to be trouble with your network connection. Retrying

原因： yarn超时，终端多次提示There appears to be trouble with your network connection. Retrying

解决如下：

//查看代理
git config list
//删除代理
git config delete  registry
//或者删除代理
git config delete proxy
//更换淘宝镜像
yarn config set registry https://registry.npm.taobao.org