info There appears to be trouble with your network connection

使用 npx create-react-app 项目名 新建项目时，报错；

yarn add v1.22.4
info No lockfile found.
[1/4]   Resolving packages...
info There appears to be trouble with your network connection. Retrying...
info There appears to be trouble with your network connection. Retrying...

解决途径：

第一步：更换淘宝镜像

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

第二步：按下面的操作

1. 全局安装nrm: npm install nrm -g;
2. 查看镜像源: nrm ls;
3. 切换镜像源: nrm use npm;
4. 安装需要的模块: npm install ;
5. 如果需要安装全部依赖: npm install;