处理样式资源
本章节学习使用 Webpack 如何处理 Css、Less、Sass、Scss、Styl 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
const path = require("path");
module.exports = {
entry: "./src/main.js",
output: {
path: path.resolve(__dirname, "dist"),
filename: "main.js",
},
module: {
rules: [
{
// 用来匹配 .css 结尾的文件
test: /\.css$/,
// use 数组里面 Loader 执行顺序是从右到左
use: ["style-loader", "css-loader"],
},
],
},
plugins: [],
mode: "development",
};
4. 添加 Css 资源
- src/css/index.css
.box1 {
width: 100px;
height: 100px;
background-color: pink;
}- src/main.js
import count from "./js/count"; import sum from "./js/sum"; // 引入 Css 资源，Webpack才会对其打包 import "./css/index.css"; console.log(count(2, 1)); console.log(sum(1, 2, 3, 4)); - public/index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>webpack5</title> </head> <body> <h1>Hello Webpack5</h1> <!-- 准备一个使用样式的 DOM 容器 --> <div class="box1"></div> <!-- 引入打包后的js文件，才能看到效果 --> <script src="../dist/main.js"></script> </body> </html>
5. 运行指令
npx webpack打开 index.html 页面查看效果
处理 Less 资源
1. 下载包
npm i less-loader -D2. 功能介绍
- less-loader：负责将 Less 文件编译成 Css 文件
3. 配置
const path = require("path");
module.exports = {
entry: "./src/main.js",
output: {
path: path.resolve(__dirname, "dist"),
filename: "main.js",
},
module: {
rules: [
{
// 用来匹配 .css 结尾的文件
test: /\.css$/,
// use 数组里面 Loader 执行顺序是从右到左
use: ["style-loader", "css-loader"],
},
{
test: /\.less$/,
use: ["style-loader", "css-loader", "less-loader"],
},
],
},
plugins: [],
mode: "development",
};
4. 添加 Less 资源
- src/less/index.less
.box2 { width: 100px; height: 100px; background-color: deeppink; } - src/main.js
import count from "./js/count"; import sum from "./js/sum"; // 引入资源，Webpack才会对其打包 import "./css/index.css"; import "./less/index.less"; console.log(count(2, 1)); console.log(sum(1, 2, 3, 4)); - public/index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>webpack5</title> </head> <body> <h1>Hello Webpack5</h1> <div class="box1"></div> <div class="box2"></div> <script src="../dist/main.js"></script> </body> </html>5. 运行指令
npx webpack打开 index.html 页面查看效果处理
Sass 和 Scss 资源
1. 下载包
npm i sass-loader sass -D注意：需要下载两个
2. 功能介绍
- sass-loader：负责将 Sass 文件编译成 css 文件
- sass：sass-loader 依赖 sass 进行编译
3. 配置
const path = require("path");
module.exports = {
entry: "./src/main.js",
output: {
path: path.resolve(__dirname, "dist"),
filename: "main.js",
},
module: {
rules: [
{
// 用来匹配 .css 结尾的文件
test: /\.css$/,
// use 数组里面 Loader 执行顺序是从右到左
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"],
},
],
},
plugins: [],
mode: "development",
};
4. 添加 Sass 资源
- src/sass/index.sass
/* 可以省略大括号和分号 */ .box3 width: 100px height: 100px background-color: hotpink - src/sass/index.scss
.box4 { width: 100px; height: 100px; background-color: lightpink; } - src/main.js
import count from "./js/count"; import sum from "./js/sum"; // 引入资源，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
<!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> <div class="box1"></div> <div class="box2"></div> <div class="box3"></div> <div class="box4"></div> <script src="../dist/main.js"></script> </body> </html>
5. 运行指令
npx webpack打开 index.html 页面查看效果
处理 Styl资源
1. 下载包
npm i stylus-loader -D2. 功能介绍
- stylus-loader：负责将 Styl 文件编译成 Css 文件
3. 配置
const path = require("path");
module.exports = {
entry: "./src/main.js",
output: {
path: path.resolve(__dirname, "dist"),
filename: "main.js",
},
module: {
rules: [
{
// 用来匹配 .css 结尾的文件
test: /\.css$/,
// use 数组里面 Loader 执行顺序是从右到左
use: ["style-loader", "css-loader"],
},
{
test: /\.less$/,
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 Styl 资源
- src/styl/index.styl
/* 可以省略大括号、分号、冒号 */ .box width 100px height 100px background-color pink - src/main.js
import { add } from "./math"; import count from "./js/count"; import sum from "./js/sum"; // 引入资源，Webpack才会对其打包 import "./css/index.css"; import "./less/index.less"; import "./sass/index.sass"; import "./sass/index.scss"; import "./styl/index.styl"; console.log(count(2, 1)); console.log(sum(1, 2, 3, 4)); - public/index.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> <div class="box2"></div> <div class="box3"></div> <div class="box4"></div> <div class="box5"></div> <script src="../dist/main.js"></script> </body> </html>
5. 运行指令
npx webpack打开 index.html 页面查看效果
