Carloin

# 一.提取 css 成单独文件

下载安装包
下载插件

npm install --save-dev mini-css-extract-plugin
修改配置文件

const { resolve } = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
module.exports = {
  entry: "./src/js/index.js",
  output: {
    filename: "js/built.js",
    path: resolve(__dirname, "build"),
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          // 创建 style 标签，将样式放入
          // 'style-loader',
          // 这个 loader 取代 style-loader。作用：提取 js 中的 css 成单独文件
          MiniCssExtractPlugin.loader,
          // 将 css 文件整合到 js 文件中
          "css-loader",
        ],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html",
    }),
    new MiniCssExtractPlugin({
      // 对输出的 css 文件进行重命名
      filename: "css/built.css",
    }),
  ],
  mode: "development",
};

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运行指令: webpack

# 二.css 兼容性处理

创建文件
下载 loader

npm install --save-dev postcss-loader postcss-preset-env
修改配置文件

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",
          {
            loader: "postcss-loader",
            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",
};

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修改 package.json

"browserslist": {
    "development": [
        "last 1 chrome version",
        "last 1 firefox version",
        "last 1 safari version"
    ],
        "production": [
            ">0.2%",
            "not dead",
            "not op_mini all"
        ]
}

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运行指令: webpack

# 三.压缩 css

创建文件
下载安装包

npm install --save-dev optimize-css-assets-webpack-plugin
修改配置文件

const { resolve } = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-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",
          {
            loader: "postcss-loader",
            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",
    }),
    // 压缩 css
    new OptimizeCssAssetsWebpackPlugin(),
  ],
  mode: "development",
};

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运行指令: webpack

# 四.js 语法检查

创建文件
下载安装包

npm install --save-dev eslint-loader eslint eslint-config-airbnb-base eslint-plugin-import
修改配置文件

const { resolve } = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-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: [
      /*语法检查： eslint-loader eslint
            注意：只检查自己写的源代码，第三方的库是不用检查的
            设置检查规则：
            package.json 中 eslintConfig 中设置~
            "eslintConfig": {
            "extends": "airbnb-base"
            }
            airbnb --> eslint-config-airbnb-base eslint-plugin-import eslint
            */
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "eslint-loader",
        options: {
          // 自动修复 eslint 的错误
          fix: true,
        },
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html",
    }),
    new MiniCssExtractPlugin({
      filename: "css/built.css",
    }),
    // 压缩 css
    new OptimizeCssAssetsWebpackPlugin(),
  ],
  mode: "development",
};

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配置 package.json

"eslintConfig": {
    "extends": "airbnb-base",
        "env": {
        "browser": true
    }
}

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运行指令: webpack

# 五.js 兼容性处理

创建文件
下载安装包

npm install --save-dev babel-loader @babel/core @babel/preset-env @babel/polyfill core-js
修改配置文件

const { resolve } = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
module.exports = {
  entry: "./src/js/index.js",
  output: {
    filename: "js/built.js",
    path: resolve(__dirname, "build"),
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "babel-loader",
        options: {
          // 预设：指示 babel 做怎么样的兼容性处理
          presets: [
            [
              "@babel/preset-env",
              {
                // 按需加载
                useBuiltIns: "usage",
                // 指定 core-js 版本
                corejs: {
                  version: 3,
                },
                // 指定兼容性做到哪个版本浏览器
                targets: {
                  chrome: "60",
                  firefox: "60",
                  ie: "9",
                  safari: "10",
                  edge: "17",
                },
              },
            ],
          ],
        },
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html",
    }),
  ],
  mode: "development",
};

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运行指令: webpack

# 六.js 压缩

创建文件

修改配置文件

const { resolve } = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
module.exports = {
  entry: "./src/js/index.js",
  output: {
    filename: "js/built.js",
    path: resolve(__dirname, "build"),
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html",
    }),
  ],
  // 生产环境下会自动压缩 js 代码
  mode: "production",
};

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运行指令: webpack

# 七.HTML 压缩

创建文件

修改配置文件

const { resolve } = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
module.exports = {
  entry: "./src/js/index.js",
  output: {
    filename: "js/built.js",
    path: resolve(\_\_\_dirname, "build"),
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html",
      // 压缩 html 代码
      minify: {
        // 移除空格
        collapseWhitespace: true,
        // 移除注释
        removeComments: true,
      },
    }),
  ],
  mode: "production",
};

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运行指令:webpack

# 八.生产环境配置

创建文件

修改配置文件

const { resolve } = require("path");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
// 定义 nodejs 环境变量：决定使用 browserslist 的哪个环境
process.env.NODE_ENV = "production";
// 复用 loader
const commonCssLoader = [
  MiniCssExtractPlugin.loader,
  "css-loader",
  {
    // 还需要在 package.json 中定义 browserslist
    loader: "postcss-loader",
    options: {
      ident: "postcss",
      plugins: () => [require("postcss-preset-env")()],
    },
  },
];
module.exports = {
  entry: "./src/js/index.js",
  output: {
    filename: "js/built.js",
    path: resolve(__dirname, "build"),
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [...commonCssLoader],
      },
      {
        test: /\.less$/,
        use: [...commonCssLoader, "less-loader"],
      },
    /*正常来讲，一个文件只能被一个 loader 处理。
    当一个文件要被多个 loader 处理，那么一定要指定 loader 执行的先后顺序：
    先执行 eslint 在执行 babel
    */
      {
        // 在 package.json 中 eslintConfig --> airbnb
        test: /\.js$/,
        exclude: /node_modules/,
        // 优先执行
        enforce: "pre",
        loader: "eslint-loader",
        options: {
          fix: true,
        },
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "babel-loader",
        options: {
          presets: [
            [
              "@babel/preset-env",
              {
                useBuiltIns: "usage",
                corejs: { version: 3 },
                targets: {
                  chrome: "60",
                  firefox: "50",
                },
              },
            ],
          ],
        },
      },
      {
        test: /\.(jpg|png|gif)/,
        loader: "url-loader",
        options: {
          limit: 8 * 1024,
          name: "[hash:10].[ext]",
          outputPath: "imgs",
          esModule: false,
        },
      },
      {
        test: /\.html$/,
        loader: "html-loader",
      },
      {
        exclude: /\.(js|css|less|html|jpg|png|gif)/,
        loader: "file-loader",
        options: {
          outputPath: "media",
        },
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "css/built.css",
    }),
    new OptimizeCssAssetsWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: "./src/index.html",
      minify: {
        collapseWhitespace: true,
        removeComments: true,
      },
    }),
  ],
  mode: "production",
};

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运行指令: webpack

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