css-loader

//webpack.config.js
module: {
    rules: [ //在这里面定义指定文件对应的解释器
      //规则定义
      {
        test: /\.js$/, //正则
        exclude: /node_modules/,
        use: {
          loader: "babel-loader", //根据 .babelrc 文件艰辛规则渲染
        },
      },
      {
        test: /\.(s[ac]|c)ss$/i, //正则
        use: ["style-loader", "css-loader", "sass-loader"],
      },
    ]
},

yarn add -D mini-css-extract-plugin

//webpack.config.js
const MiniCssExtractPlugin = require("mini-css-extract-plugin"); //引入插件
plugins: [new MiniCssExtractPlugin()], 加载插件
 module: {
    rules: [
      {
        test: /\.(s[ac]|c)ss$/i,
        use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"], //应用插件
      },
    ],
},

yarn add -D postcss postcss-loader postcss-preset-env

//webpack.config.js
module: {
    rules: [
      //规则定义
      {
        test: /\.(s[ac]|c)ss$/i,
        use: [
          MiniCssExtractPlugin.loader,
          "css-loader",
          "sass-loader",
          "post-loader", //添加post-loader加载器
        ],
      },
    ],
  },

//postcss.config.js
module.exports = {
  plugins: [require("postcss-preset-env")],
};

// 示例
last 2 versions // 回退两个浏览器版本
> 0.5% // 全球超过0.5%人使用的浏览器
IE 10 //兼容IE 10