You can check result here: https://codepen.io/markliu2013/pen/YaXXVG
NOTE: Firstly you need to install NodeJS.
$ git clone --depth 1 https://github.com/markliu2013/reactjs-calculator.git
$ cd reactjs-calculator
$ npm install
$ node app.js or nohup node app.js &
Then visit http://127.0.0.1:3000/