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处理样式资源 ​

使用 Webpack 如何处理 Css、Less、Sass、Scss、Stylus 样式资源

介绍 ​

Webpack 本身是不能识别样式资源的，所以我们需要借助 Loader 来帮助 Webpack 解析样式资源

我们找 Loader 都应该去官方文档中找到对应的 Loader，然后使用

官方文档找不到的话，可以从社区 Github 中搜索查询

Webpack官方Loader文档

处理CSS资源 ​

1、下载包 ​

npm i css-loader style-loader -D

注意：需要下载两个 loader

2、功能介绍 ​

  • css-loader：负责将 Css 文件编译成 Webpack 能识别的模块
  • style-loader：会动态创建一个 Style 标签，里面放置 Webpack 中 Css 模块内容

此时样式就会以 Style 标签的形式在页面上生效

3、配置 ​

js
const path = require('path')

module.exports = {
  
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js'
  },
  module: {
    rules: [{
      test: /\.css$/,
      use: ['style-loader','css-loader'] // 执行顺序从右到左（css->style）
    }]
  },
  plugins: [],
  mode: 'development'

}

4、添加CSS资源 ​

  • src/css/index.css
css
.box1 {
  width: 100px;
  height: 100px;
  background-color: pink;
}
  • src/main.js
js
import count from "./js/count";
import sum from "./js/sum";
// 引入 Css 资源，Webpack才会对其打包
import "./css/index.css";

console.log(count(2, 1));
console.log(sum(1, 2, 3, 4));
  • public/index.html
html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>webpack5</title>
  </head>
  <body>
    <h1>Hello Webpack5</h1>
    <!-- 准备一个使用样式的 DOM 容器 -->
    <div class="box1"></div>
    <!-- 引入打包后的js文件，才能看到效果 -->
    <script src="../dist/main.js"></script>
  </body>
</html>

5、运行指令 ​

npx webpack

处理Less资源 ​

1、下载包 ​

npm i less-loader -D

2、功能介绍 ​

  • less-loader：负责将 Less 文件编译成 css文件

3、配置 ​

js
const path = require('path')

module.exports = {
  
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js'
  },
  module: {
    rules: [{
      test: /\.css$/,
      use: ['css-loader, style-loader']
    },{
      test: /\.less$/,
      use: ['less-loader']
    }]
  },
  plugins: [],
  mode: 'development'

}

4、添加Less资源 ​

  • src/less/index.less
css
.box2 {
  width: 100px;
  height: 100px;
  background-color: green;
}
  • src/main.js
js
import count from "./js/count";
import sum from "./js/sum";
// 引入 Css 资源，Webpack才会对其打包
import "./css/index.css";
import "./less/index.less";

console.log(count(2, 1));
console.log(sum(1, 2, 3, 4));
  • public/index.html
html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>webpack5</title>
  </head>
  <body>
    <h1>Hello Webpack5</h1>
    <!-- 准备一个使用样式的 DOM 容器 -->
    <div class="box1"></div>
    <!-- 引入打包后的js文件，才能看到效果 -->
    <script src="../dist/main.js"></script>
  </body>
</html>

5、运行指令 ​

npx webpack

处理Sass和Scss资源 ​

1、下载包 ​

npm i sass-loader sass -D

2、功能介绍 ​

  • sass-loader：负责将 Sass 文件编译成 css文件
  • sass: Sass-loader依赖Sass进行编译

3、配置 ​

js
const path = require('path')

module.exports = {
  
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js'
  },
  module: {
    rules: [{
      test: /\.css$/,
      use: ['css-loader, style-loader']
    },{
      test: /\.less$/,
      use: ['css-loader, style-loader','less-loader']
    },{
        test: /\s[ac]ss$/,
        use: ['css-loader, style-loader','sass-loader']
    }]
  },
  plugins: [],
  mode: 'development'

}

4、添加Sass资源 ​

  • src/sass/index.sass
css
.box3 {
  width: 100px;
  height: 100px;
  background-color: red;
}
  • src/sass/index.scss
css
.box4 {
  width: 100px;
  height: 100px;
  background-color: blue;
}
  • src/main.js
js
import count from "./js/count";
import sum from "./js/sum";
// 引入 Css 资源，Webpack才会对其打包
import "./css/index.css";
import "./less/index.less";
import "./sass/index.sass";
import "./sass/index.scss";

console.log(count(2, 1));
console.log(sum(1, 2, 3, 4));
  • public/index.html
html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>webpack5</title>
  </head>
  <body>
    <h1>Hello Webpack5</h1>
    <!-- 准备一个使用样式的 DOM 容器 -->
    <div class="box1"></div>
    <!-- 引入打包后的js文件，才能看到效果 -->
    <script src="../dist/main.js"></script>
  </body>
</html>

5、运行指令 ​

npx webpack

处理Stylus资源 ​

1、下载依赖 ​

npm install stylus-loader -D

2、功能介绍 ​

  • stylus-loader：负责将 Stylus 文件编译成 Css 文件

3、配置 ​

js
const path = require('path')

module.exports = {
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js'
  },
  module: {
    rules: [{
      test: /\.css$/,
      use: ['style-loader', 'css,loader']
    },{
      test: /\.less$/,
      use: ['style-loader','css-loader','less-loader']
    },{
        test: /\.s[ac]ss$/,
        use: ['style-loader','css-loader','sass-loader']
    },{
        test: /\.styl$/,
        use: ['style-loader','css-loader','stylus-loader']
    }]
  },
  plugins:[]
  mode: 'development'
}

4、添加stylus资源 ​

  • src/stylus/index.styl
css
.box5 {
  width: 100px;
  height: 100px;
  background-color: yellow;
}
  • src/main.js
js
import count from "./js/count";
import sum from "./js/sum";
// 引入 Css 资源，Webpack才会对其打包
import "./css/index.css";
import "./less/index.less";
import "./sass/index.sass";
import "./sass/index.scss";
import "./stylus/index.styl"

console.log(count(2, 1));
console.log(sum(1, 2, 3, 4));
  • public/index.html
html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>webpack5</title>
  </head>
  <body>
    <h1>Hello Webpack5</h1>
    <!-- 准备一个使用样式的 DOM 容器 -->
    <div class="box1"></div>
    <!-- 引入打包后的js文件，才能看到效果 -->
    <script src="../dist/main.js"></script>
  </body>
</html>

5、运行指令 ​

npx webpack

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