Wabpack 打包 - 9. CSS 兼容性处理

不同型号、版本的浏览器对CSS的支持程度不同，使用 postcss 插件对不同的浏览器做兼容。

 1.文件结构

 

 

 

2.安装 postcss

$ npm i postcss-loader@3.0.0 postcss-preset-env@6.7.0 -D

 

 3. a.css

#box1 {
    width: 100px;
    height: 100px;
    background-color: pink;
    display: flex;
    backface-visibility: hidden;
}

 

b.css

#box2 {
    width: 200px;
    height: 200px;
    background-color: deeppink;
}

 

index.js

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

 

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>

 

webpack.config.js

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

//设置 nodejs 环境变量
// process.env.NODE_ENV = 'development'

module.exports = {
    entry: './src/js/index.js',
    output: {
        filename: "js/built.js",
        path: resolve(__dirname, 'build')
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    /*
                    css兼容性处理：postcss --> postcss-loader   postcss-preset-env 插件
                    postcss 依赖于 post-loader.
                    帮 postcss 找到 package.json 中 browserslist 里面的配置，通过配置加载指定的css兼容性样式

                    "browserslist": {
                        // 开发环境 --> 设置node环境变量：process.env.NODE_ENV = development
                        "development": [
                          "last 1 chrome version",
                          "last 1 firefox version",
                          "last 1 safari version"
                        ],
                        // 生产环境：默认是看生产环境
                        "production": [
                          ">0.2%",
                          "not dead",
                          "not op_mini all"
                        ]
                      },

                    "last 1 chrome version" 表示兼容最近版本的 chrome
                    ">0.2%" 表示大于 99.8% 的浏览器
                    "not dead" 表示不要已经死去的浏览器(如 IE10)
                    "not op_mini all" 表示要 欧朋mini 浏览器 (不兼容已经死去的浏览器)

                    执行webpack命令打包后，查看生成的css文件，对有兼容性的代码，会做兼容性处理

                    */

                    // 使用loader的默认配置
                    // 'postcss-loader',
                    // 修改loader的配置
                    {
                        loader: "postcss-loader",
                        // 修改loader的配置
                        options: {
                            ident: 'postcss',
                            plugins: () => [
                                //postcss 的插件
                                require('postcss-preset-env')()
                            ]
                        }
                    }
                ]
            }
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: "./src/index.html"
        }),
        new MiniCssExtractPlugin({
            filename: 'css/built.css'
        })
    ],
    mode: "development"
}

 

package.json

{
  "name": "webpack_code",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.8.4",
    "@babel/polyfill": "^7.12.1",
    "@babel/preset-env": "^7.18.10",
    "add-asset-html-webpack-plugin": "^3.2.2",
    "babel": "^6.23.0",
    "babel-loader": "^8.0.6",
    "core-js": "^3.24.1",
    "css-loader": "^3.4.2",
    "eslint": "^6.8.0",
    "eslint-config-airbnb-base": "^14.0.0",
    "eslint-loader": "^3.0.3",
    "eslint-plugin-import": "^2.20.1",
    "file-loader": "^5.0.2",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "less": "^3.11.1",
    "less-loader": "^5.0.0",
    "mini-css-extract-plugin": "^0.9.0",
    "optimize-css-assets-webpack-plugin": "^5.0.3",
    "postcss-loader": "^3.0.0",
    "postcss-preset-env": "^6.7.0",
    "style-loader": "^1.1.3",
    "terser-webpack-plugin": "^2.3.5",
    "thread-loader": "^2.1.3",
    "url-loader": "^3.0.0",
    "webpack": "^4.41.6",
    "webpack-cli": "^3.3.11",
    "webpack-dev-server": "^3.10.3",
    "workbox-webpack-plugin": "^5.0.0"
  },
  "dependencies": {
    "jquery": "^3.6.0"
  },
  "browserslist": {
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ],
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ]
  },
  "eslintConfig": {
    "extends": "airbnb-base",
    "env": {
      "browser": true
    }
  },
  "sideEffects": [
    "*.css",
    ".less"
  ]
}

 

4.打包：

$ webpack

 

5.生成文件

 

 

生成的 css 文件已经做了兼容性处理。

 

 

end~

 

posted @ 2022-09-08 14:12  Evengod  阅读(79)  评论(0)  编辑  收藏  举报