1. Installation react react-dom
npm install react react-dom --save
2. Installation @ babel / preset-react
npm install --save-dev @babel/preset-react
Configuration 1 .babelrc (this file is executed from bottom to top, right to left is executed by preseet-env switch ES5 is es6)
4. Configuration 1 webpackconfig.js (parameter options to move the file to the .bablerc)
4.index.js (ps: polyfill es6 turn is introduced es5 demand)
5. Effect
