将css从js中提取出来

webpack编译打包时,css是被放在 js 中的,通过 style 标签加载到页面上,通过将 css 从 js中提取出来,可以使用 link 方式加载 css

用到一个插件 , mini-css-extract-plugin

首先下载这个插件  npm install --save-dev mini-css-extract-plugin

src / index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>webpack</title>
</head>
<body>
    <div id="box1"></div>
    <div id="box2"></div>
</body>
</html>

src / index.js

import './css/a.css'
import './css/b.css'

webpack.config.js

const {resolve} = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports={
    entry:'./src/index.js',
    output:{
        filename:'bundle.js',
        path:resolve(__dirname,'build')
    },
    module:{
        rules:[
            {
                test:/\.css$/,
                use:[
                    MiniCssExtractPlugin.loader, //这个loader取代style-loader,将css从js中提取出来
                    'css-loader'
                ]
            }
        ]
    },
    plugins:[
        new HtmlWebpackPlugin({
            template:'./src/index.html'
        }),
        new MiniCssExtractPlugin({
            filename:'bundle.css' //对输出的css文件进行重命名
        })
    ],
    mode:'development'
}

npx webpack 执行后,生成一个 bundle.css 文件(进行了重命名,默认是 main.css)

build / bundle.css

#box1{
    width:100px;
    height:100px;
    background-color: red;
}
#box2{
    width:100px;
    height:100px;
    background-color: blue;
}

build / index.html 生成的 html 中自动通过 link 方式引入样式文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>webpack</title>
<link href="bundle.css" rel="stylesheet"></head>
<body>
    <div id="box1"></div>
    <div id="box2"></div>
<script src="bundle.js"></script></body>
</html>

 

posted @ 2020-06-05 09:09  shanlu  阅读(720)  评论(0编辑  收藏  举报