yarn安装依赖包报错，error An unexpected error occurred: “https://registry.npm.taobao.orgnpm/element-ui: getaddrinfo ENOTFOUND registry.npm.taobao.orgnpm registry.npm.taobao.orgnpm:443”.

这是因为网络不好导致的下载依赖包请求超时报错，更改下载地址即可。
解决：步骤1.请求地址设置成淘宝源

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

步骤2.对node-sass镜像源进行设置

yarn config set sass-binary-site http://npm.taobao.org/mirrors/node-sass