1.查看当前镜像源

yarn config get registry
2.临时修改yarn源 
yarn save package_name --registry https://registry.npm.taobao.org/
3.修改yarn源为taobao源
yarn config set registry https://registry.npm.taobao.org/
4.修改yarn源为官方源
yarn config set registry https://registry.yarnpkg.com

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