npm, yarn 查看源和换源

# 查看npm当前镜像源
npm config get registry

# 设置npm镜像源为淘宝镜像
npm config set registry https://registry.npm.taobao.org/

# 查看yarn当前镜像源
yarn config get registry

# 设置yarn镜像源为淘宝镜像
yarn config set registry https://registry.npm.taobao.org/