Detailed introduction to examples of webpack processing CSS

1. Install the plug-in

## npm i style-loader css-loader --save-dev npm i postcss-loader --save-dev npm i autoprefixer --save-dev npm install postcss-import --save-dev Copy after login

The style-loader plug-in is: insert the CSS by injecting the tag Add to DOM

autoprefixer automatically adds prefix

postcss-import: supports using @import to introduce css

2. Project directory structure:

common.css is: @import './flex.css'; html,body{ padding: 0; margin: 0; background-color: red; }ul{ list-style: none; margin: 0; } Copy after login

flex.css is:

.flex-p{ display: flex; } Copy after login

app.js is:

import './css/common.css'; import layer from './components/layer/layer.js'const App = function(){ console.log(layer) }new App() Copy after login

##3. webpack The .config.js configuration file is:

var htmlWebpackPlugin = require('html-webpack-plugin'); module.exports = { entry: './src/app.js', output: { path: __dirname + '/dist', filename: 'js/[name].js' }, module: { loaders: [{ test: /\.js$/, //以下目录不处理 exclude: /node_modules/, //只处理以下目录 include: /src/, loader: "babel-loader", //配置的目标运行环境（environment）自动启用需要的 babel 插件 query: { presets: ['latest'] } }, //css 处理这一块 { test: /\.css$/, use: [ 'style-loader', { loader: 'css-loader', options: { //支持@important引入css importLoaders: 1 } }, { loader: 'postcss-loader', options: { plugins: function() { return [ //一定要写在require("autoprefixer")前面，否则require("autoprefixer")无效 require('postcss-import')(), require("autoprefixer")({ "browsers": ["Android >= 4.1", "iOS >= 7.0", "ie >= 8"] }) ] } } } ] } ] }, plugins: [ new htmlWebpackPlugin({ template: 'index.html', filename: 'index.html' }) ] } Copy after login

4. Execute compilation & view the results npm run webpack Copy after login