NPM

查询当前镜像

npm get registry 

 设置为淘宝镜像

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

 设置为官方镜像

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

 YARN

查询当前镜像

yarn config get registry

 设置为淘宝镜像

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

 设置为官方镜像

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