通过npm安装：npm install -g yarn 查看yarn版本：yarn -v 查看镜像源：yarn config get registry 设置为淘宝镜像源：https://m.50zw.co/book/142423/51366433_2.html
npm install -g yarn
yarn -v
yarn config get registry
https://m.50zw.co/book/142423/51366433_2.html
