Let's talk about how to compress and package html resources in webpack

How to compress and package html resources in webpack? The following article will give you a brief introduction to the method of compressing and packaging HTML resources with webpack. I hope it will be helpful to you!

Why do you need to package html resources?

When writing code, the js file under src is introduced. After being packaged by webpack, it is formed An entry file is created. At this time, the name and path of the js file in the html are incorrect, so webpack packaging is needed to replace the path of the js file introduced in the html.

The benefits of using webpack to package html are:

(1) The packaged js file can be automatically introduced into html

(2) HTML packaging It will still be generated in the build folder and put together with the packaged js files. In this way, when going online, we only need to copy the packaged and generated folders to the online environment.

(3) Will Help us compress html files

How to compress and package html resources in webpack

1. Install the plug-in

Webpack can only understand JS and JSON files natively. To support packaging other types of files, you need to install the corresponding plug-ins or loaders.

If we need to package HTML files, we first need to install html-webpack-pluginPlug-in:

npm install html-webpack-plugin -D

The role of this plug-in:

• By default, an html file is created under the export, and then all JS/CSS resources are imported.

• We can also specify an html file ourselves and add resources to this html file

2. Webpack.config.js configuration

Install the html-webpack-plugin plug-in Finally, you need to configure it in the webpack.config.js file:

 // ...
 // 1. 引入插件
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 
 module.exports = {
   // ...
   // 2. 在plugins中配置插件
   plugins: [
     new HtmlWebpackPlugin({
       template: 'index.html', // 指定入口模板文件（相对于项目根目录）
       filename: 'index.html', // 指定输出文件名和位置（相对于输出目录）
       // 关于插件的其他项配置，可以查看插件官方文档
     })
   ]
 }

Detailed configuration link: https://www.npmjs.com/package/html-webpack- plugin

Make sure the path and file name of the entry template file are consistent with the configuration, and then you can compile.

3. Configuration of multiple JS entries and multiple HTML situations

When faced with the need to compile multiple HTML files, and the files need to introduce different JS files, but by default, the packaged HTML file will import all packaged JS files, we can specify chunk to allocate JS.

 const path = require('path');
 // 1. 引入插件
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 module.exports = {
   // ...
   // 2. 配置JS入口(多入口)
   entry: {
     vendor: ['./src/jquery.min.js', './src/js/common.js'],
     index: './src/index.js',
     cart: './src/js/cart.js'
   },
   // 配置出口
   output: {
     filename: '[name].js',
     path: path.resolve(__dirname, 'build/js')
   },
   // 3. 配置插件
   plugins: [
     new HtmlWebpackPugin({
       template: 'index.html',
       filename: 'index.html',
       // 通过chunk来指定引入哪些JS文件
       chunk: ['index', 'vendor']
     }),
     // 需要编译多少个HTML，就需要new几次插件
     new HtmlWebpackPlugin({
       template: './src/cart.html',
       filename: 'cart.html',
       chunk: ['cart', 'vendor']
     })
   ]
 }

Tip: What you need to pay attention to here is how many HTML files you need to compile, how many times you need to new HtmlWebpackPlugin.

After the above configuration is compiled successfully, the output is as follows:

 build
 |__ index.html # 引入index.js和vendor.js
 |__ cart.html    # 引入cart.js和vendor.js
 |__ js
      |__ vendor.js # 由jquery.min.js和common.js生成
      |__ index.js    # 由index.js生成
      |__ cart.js       # 由cart.js生成

Compressed and packaged html resource example

1. webpack. config.js configuration

const HTMLWebpackPlugin = require('html-webpack-plugin')
...
 plugins: [
    // html-webpack-plugin  html 打包配置 该插件将为你生成一个 HTML5 文件
    new HTMLWebpackPlugin({
      template: "./index.html", // 打包到模板的相对或绝对路径 （打包目标）
      title: '首页', // 用于生成的HTML文档的标题
      hash: true,//true则将唯一的webpack编译哈希值附加到所有包含的脚本和CSS文件中。主要用于清除缓存,
      minify: {  // 压缩html
        collapseWhitespace: true, // 折叠空白区域
        keepClosingSlash: true,  // 保持闭合间隙
        removeComments: true,   // 移除注释
        removeRedundantAttributes: true, // 删除冗余属性
        removeScriptTypeAttributes: true,  // 删除Script脚本类型属性
        removeStyleLinkTypeAttributes: true, // 删除样式链接类型属性
        useShortDoctype: true, // 使用短文档类型
        preserveLineBreaks: true, // 保留换行符
        minifyCSS: true, // 压缩文内css
        minifyJS: true, // 压缩文内js
      }
    }),
  ],
...

2. At this time our index.html

<!DOCTYPE html>
<html lang="">
  <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>webpackDemo</title>
  </head>
  <body>
    <div id="app">
      html 打包配置
    </div>
  </body>
</html>

3. At this time our index.js

import './../css/index.less'

function add(x,y) {
 return x+y
}
console.log(add(2,3));

3. Console webpack input package , found that there is an extra index.html in the packaged output file, the content is as follows

<!DOCTYPE html>
<html lang="">
  <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>webpackDemo</title>
  <script defer src="index.js"></script></head>
  <body>
    <div id="app">
      html 打包配置
    </div>
  </body>
</html>

<script defer src="index.js"></script> is automatic The introduced

browser opened the packaged output index.html and found that the style had an effect, and the control unit also output normally:

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