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2018年开始学习react,webpack已经发展到了4.0版本,react也已经是16.2,一切都和以前有所不同。

1. hello world

先初始化项目目录,在根目录下执行

yarn init -y

yarn add react react-dom 
yarn add -D webpack webpack-cli babel-cli babel-loader babel-preset-es2015 babel-preset-react

创建 .babelrc 文件,配置为

{
  "presets": [
    ["es2015", {"modules": false}], 
    "react"
  ]
}