1. 工程配置
（1）新建工程目录，并进入
$ mkdir webpack-babel-react-sass && cd webpack-babel-react-sass
（2）项目初始化
$ npm init
会提示输入一些工程相关的信息，
全部使用默认值即可，最后会写入到./package.json中
（3）安装开发环境依赖
$ npm install --save-dev \
webpack \
babel-core babel-loader babel-preset-es2015 babel-preset-react \
css-loader style-loader sass-loader node-sass \
extract-text-webpack-plugin
会自动修改./package.json。
其中，babel相关的有，babel-core babel-loader babel-preset-es2015 babel-preset-react，sass相关的有，css-loader style-loader sass-loader node-sass。
extract-text-webpack-plugin是一个webpack插件，用于将样式表提取到单独的文件中。
（4）安装代码依赖
$ npm install --save react react-dom
会自动修改./package.json
（5）配置babel
新建.babelrc文件
{
"presets": [
"es2015",
"react"
]
}
（6）配置webpack
新建webpack.config.js
const path = require('path');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
module.exports = {
context: path.resolve(__dirname, ''),
entry: [
path.resolve(__dirname, 'src/index.jsx')
],
output: {
path: path.resolve(__dirname, 'dist/'),
filename: 'index.js'
},
module: {
loaders: [
{
test: /\.jsx$/,
loader: 'babel-loader'
},
{
test: /\.scss$/,
loaders: ExtractTextPlugin.extract({
fallback: 'style-loader',
use: ['css-loader', 'sass-loader']
})
}
]
},
plugins: [
new ExtractTextPlugin('index.css')
]
};
当前目录结构
+ node_modules
.babelrc
package.json
webpack.config.js
2. 示例代码
新建component和src目录
添加以下5个文件，
component/hello.jsx，component/hello.scss，
src/index.jsx，src/index.scss，src/index.html，
目录结构如下，
- component
hello.jsx
hello.scss
+ node_modules
- src
index.jsx
index.scss
.babelrc
package.json
webpack.config.js
（1）component/hello.jsx
import React, { Component } from 'react';
import './hello.scss';
class Hello extends Component {
render() {
return (
<span className="hello">hello</span>
);
}
}
export default Hello;
（2）component/hello.scss
.hello {
color:red;
}
（3）src/index.jsx
import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import Hello from '../component/hello.jsx';
import './index.scss';
ReactDOM.render(
<div className="page">
<Hello />
</div>,
document.getElementById('page')
);
（4）src/index.scss
.page {
font-size:20px;
}
（5）src/index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" href="../dist/index.css">
</head>
<body>
<div id="page"></div>
<script src="../dist/index.js"></script>
</body>
</html>
3. 编译运行
（1）编译并监控文件改变
$ webpack --watch
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