NPM

1. 查询当前镜像

npm get registry 

2. 设置为淘宝镜像

npm config set registry https://registry.npm.taobao.org/        (旧地址，不再维护，可以使用)
npm config set registry https://registry.npmmirror.com/         (最新地址)

3. 设置为官方镜像

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

YARN（同理）

1. 查询当前镜像

yarn config get registry

2. 设置为淘宝镜像

yarn config set registry https://registry.npm.taobao.org/        (旧地址)
yarn config set registry https://registry.npmmirror.com/         (最新地址)

3. 设置为官方镜像

yarn config set registry https://registry.yarnpkg.com