Download the official website: https://yarnpkg.com/zh-Hans/docs/install#windows-stable
Node, Yarn installation
https://segmentfault.com/a/1190000011624238
mounting node.js while automatically install npm: an input node -v (or node --version) and to the cmd npm -v
Input cmd lower yarn --version, not as an internal command prompt, type: npm install -g yarn, and then enter the yarn --version