npm、yarn查看源和换源 ​

npm config get registry  // 查看npm当前镜像源

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

npm config set registry https://registry.npmjs.org/  //还原npm镜像配置

yarn config get registry  // 查看yarn当前镜像源

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