yarn+webpack+react

yarn init

yarn add webpack

yarn add react react-dom

yarn add webpack@3.11.0 webpack-dev-server@2.11.2(温馨提示：版本太高有时会出问题)

yarn add babel-core babel-loader babel-preset-es2015 babel-preset-react

yarn add url-loader file-loader

yarn add css-loader style-loader