{"id":284,"date":"2021-08-23T21:18:21","date_gmt":"2021-08-23T13:18:21","guid":{"rendered":"http:\/\/gjweb.top\/?p=284"},"modified":"2021-08-23T21:18:22","modified_gmt":"2021-08-23T13:18:22","slug":"webapck-%e5%8a%9f%e8%83%bd%e6%80%bb%e7%bb%93%ef%bc%88%e4%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/gjweb.top\/?p=284","title":{"rendered":"webapck \u529f\u80fd\u603b\u7ed3\uff08\u4e00\uff09"},"content":{"rendered":"\n
  1. \u81ea\u52a8\u517c\u5bb9 css \u524d\u7f00 postcss-loader postcss-preset-env<\/li>
  2. \u9759\u6001\u8d44\u6e90\u5185\u8054 raw-loader<\/li>
  3. \u79fb\u52a8\u7aefcss PX \u81ea\u52a8\u8f6c\u6362\u4e3a rem<\/li>
  4. \u591a\u9875\u9762\u901a\u7528\u6253\u5305\u65b9\u6848<\/li>
  5. \u5feb\u901f\u5b9a\u4f4d\u6e90\u7801<\/li>
  6. \u57fa\u7840\u5305\u548c\u516c\u5171\u811a\u672c\u5206\u79bb<\/li>
  7. tree shaking (\u6447\u6811\u4f18\u5316)<\/li>
  8. scope hoisting<\/li>
  9. \u4ee3\u7801\u5206\u5272\u548c\u52a8\u6001import<\/li>
  10. webpack\u96c6\u6210eslint<\/li><\/ol>\n\n\n\n
    \n\n\n\n

    \u81ea\u52a8\u517c\u5bb9css\u524d\u7f00<\/h2>\n\n\n\n

    \u5b89\u88c5<\/p>\n\n\n\n

    npm install postcss-loader postcss-preset-env --save-dev<\/code><\/pre>\n\n\n\n
    \u914d\u7f6e webpack.config.js \u6587\u4ef6<\/p>\n\n\n\n
    module.exports = {
        module:{
            rules:[
                {
                   test: \/.less$\/,
                    use: [
                      MiniCssExtractPlugin.loader,
                      'css-loader',
                      'less-loader',
                      {
                        loader: 'postcss-loader',
                        options: {
                          postcssOptions:{
                            plugins:[
                              [
                                \"postcss-preset-env\",
                                {
                                  ident: \"postcss\"
                                },
                              ]
                            ]
                          }
                        }
                      }
                    ] 
                }
            ]
        }
    }<\/code><\/pre>\n\n\n\n
    \u914d\u7f6e\u5b8c\u6210\u540e\u518d\u6839\u76ee\u5f55\u521b\u5efa .browserslistrc \u6587\u4ef6<\/p>\n\n\n\n
    last 2 version
        > 1%
        iOS >= 7
        Android > 4.1
        Firefox > 20<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u9759\u6001\u8d44\u6e90\u5185\u8054<\/h2>\n\n\n\n
    \u9759\u6001\u8d44\u6e90\u5185\u8054\u6307\u7684\u662f\uff0c\u628a JS \u6216\u8005 css\\ \u56fe\u7247 \\ \u5b57\u4f53\u7b49\u4ee3\u7801\u5185\u5d4c\u5230HTML\u4e2d\u53bb\u3002\u4e5f\u53ef\u4ee5\u4f5c\u4e3a\u516c\u5171\u90e8\u5206\u4f7f\u7528<\/p>\n\n\n\n
    \u4f18\u70b9\uff1a \u51cf\u5c11 HTTP \u7f51\u7edc\u8bf7\u6c42\u6570 \u3001 css\u5185\u655b\u907f\u514d\u9875\u9762\u95ea\u52a8<\/p>\n\n\n\n
    \u5b89\u88c5<\/p>\n\n\n\n
    npm install raw-loader@5.0.1 --save-dev<\/code><\/pre>\n\n\n\n
    \u914d\u7f6e \u5728 HTML \u4e2d<\/p>\n\n\n\n
    <%= require(\"raw-loader!.\/xxx.html\")%>
    <script>
        <%= require(\"raw-loader!babel-loader!..\/node_modules\/lib-flexible\/flexible.js\")%>
    <\/script><\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u79fb\u52a8\u7aef CSS px \u81ea\u52a8\u8f6c\u6362\u4e3a rem<\/h2>\n\n\n\n
    \u5b89\u88c5<\/p>\n\n\n\n
    npm install px2rem-loader --save-dev
    npm install lib-flexible --save<\/code><\/pre>\n\n\n\n
    \u914d\u7f6e webpack.config.js<\/p>\n\n\n\n
    module.exports = {
        modele:{
            rules:[
                {
                    test:\/.less$\/,
                    use:[
                        {
                            loader:'px2rem-loader',
                            optins:{
                                remUnit:75, \/\/ 1rem = 75rpx
                                remPrecesion:8 \/\/ px \u8f6c rem \u5c0f\u6570\u70b9\u4f4d\u6570
                            }
                        }
                    ]
                }
            ]
        }
    }<\/code><\/pre>\n\n\n\n
    \u5728 HTML\u9875\u9762\u4e2d\u9759\u6001\u5f15\u5165 lib-flexible<\/p>\n\n\n\n
    <head>
        <script><%=require('raw-loader!babel-loader!..\/node_modules\/lib-flexible\/flexible.js')%><\/script>
    <\/head><\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u591a\u9875\u9762\u901a\u7528\u6253\u5305\u65b9\u6848<\/h2>\n\n\n\n
    \u5b89\u88c5<\/p>\n\n\n\n
    npm install glob html-webpack-plugin --save-dev<\/code><\/pre>\n\n\n\n
    \u914d\u7f6e webpack.config.js \u6587\u4ef6<\/p>\n\n\n\n
    const glob = require(\"glob\")
    const HtmlWebpackPlugin = require('html-webpack-plugin');
    const setMPA = () => {
      const entry = {};
      const htmlWebpackPlugins = [];
      const entryFiles = glob.sync(path.join(__dirname, '.\/src\/*\/index.js'))
      Object.keys(entryFiles).map(index => {
          const entryFile = entryFiles[index];
          const match = entryFile.match(\/src\\\/(.*)\\\/index\\.js\/)
          const pageName = match && match[1];
          entry[pageName] = entryFile;
          htmlWebpackPlugins.push(
            new HtmlWebpackPlugin({
              template: path.join(__dirname, `src\/${pageName}\/index.html`),
              filename: `${pageName}.html`,
              chunks: ['vendors', pageName],
            })
          )
      })
      return {
        entry,
        htmlWebpackPlugins
      }
    }
    const { entry, htmlWebpackPlugins } = setMPA()
    module.exports = {
        entry:entry,
        output: {
            path: path.join(__dirname, 'dist'),
            filename: '[name]_[chunkhash:8].js'
        },
        plugins:[].concat(htmlWebpackPlugins)
    }<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u5feb\u901f\u5b9a\u4f4d\u6e90\u7801<\/h2>\n\n\n\n
    \u6ce8\u610f: \u5f00\u53d1\u73af\u5883\u5f00\u542f,\u7ebf\u4e0a\u73af\u5883\u9700\u8981\u5173\u95ed\u6b64\u529f\u80fd. \u907f\u514d\u5bfc\u81f4\u4e1a\u52a1\u4ee3\u7801\u7684\u6cc4\u9732<\/strong><\/p>\n\n\n\n
    \u4f7f\u7528 sourcemap \u5b9a\u4f4d\u6e90\u7801<\/p>\n\n\n\n
    source map \u5173\u952e\u5b57<\/p>\n\n\n\n
    \u5173\u952e\u5b57<\/th>\u63cf\u8ff0<\/th><\/tr><\/thead>
    eval<\/td>\u4f7f\u7528 eval \u5305\u88f9\u819c\u5757\u4ee3\u7801<\/td><\/tr>
    source map<\/td>\u4ea7\u751f .map \u6587\u4ef6<\/td><\/tr>
    cheap<\/td>\u4e0d\u5305\u542b\u5217\u4fe1\u606f<\/td><\/tr>
    inline<\/td>\u5c06 .map \u4f5c\u4e3a DataURI \u5d4c\u5165, \u4e0d\u5355\u72ec\u751f\u6210.map\u6587\u4ef6<\/td><\/tr>
    module<\/td>\u5305\u542b loader \u7684 sourcemap<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    source map \u7c7b\u578b<\/p>\n\n\n\n
    devtool<\/th>\u662f\u5426\u9002\u5408\u751f\u4ea7\u73af\u5883<\/th>\u53ef\u4ee5\u5b9a\u4f4d\u7684\u4ee3\u7801<\/th><\/tr><\/thead>
    (none)<\/td>yes<\/td>\u6700\u7ec8\u8f93\u51fa\u7684\u4ee3\u7801<\/td><\/tr>
    eval<\/td>no<\/td>webpack \u751f\u6210\u7684\u4ee3\u7801 (\u4e00\u4e2a\u4e2a\u7684\u6a21\u5757)<\/td><\/tr>
    cheap-eval-source-map<\/td>no<\/td>\u7ecf\u8fc7 loader \u8f6c\u6362\u540e\u7684\u4ee3\u7801(\u53ea\u80fd\u770b\u5230\u884c)<\/td><\/tr>
    cheap-module-eval-source-map<\/td>no<\/td>\u6e90\u4ee3\u7801(\u53ea\u80fd\u770b\u5230\u884c)<\/td><\/tr>
    eval-source-map<\/td>no<\/td>\u6e90\u4ee3\u7801<\/td><\/tr>
    cheap-source-map<\/td>yes<\/td>\u7ecf\u8fc7loader\u8f6c\u6362\u540e\u7684\u4ee3\u7801(\u53ea\u80fd\u770b\u5230\u884c)<\/td><\/tr>
    cheap-cheap-source-map<\/td>yes<\/td>\u6e90\u4ee3\u7801(\u53ea\u80fd\u770b\u5230\u884c)<\/td><\/tr>
    inline-cheap-source-map<\/td>no<\/td>\u7ecf\u8fc7loader\u8f6c\u6362\u540e\u7684\u4ee3\u7801(\u53ea\u80fd\u770b\u5230\u884c)<\/td><\/tr>
    inlline-cheap-module-source-map<\/td>no<\/td>\u6e90\u4ee3\u7801(\u53ea\u770b\u5230\u884c)<\/td><\/tr>
    source-map<\/td>yes<\/td>\u6e90\u4ee3\u7801<\/td><\/tr>
    inline-source-map<\/td>no<\/td>\u6e90\u4ee3\u7801<\/td><\/tr>
    hidden-source-map<\/td>yes<\/td>\u6e90\u4ee3\u7801<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u914d\u7f6e webpack.confing.js \u6587\u4ef6<\/p>\n\n\n\n
    'use strict'
    module.exports = {
        devtool:\"source-map\"
    }<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u57fa\u7840\u5305\u548c\u516c\u5171\u811a\u672c\u5206\u79bb<\/h2>\n\n\n\n
    webpack4\u5185\u7f6e\u4e86 SplitChunksPlugin \u66ff\u4ee3 webpack3\u4e2d\u7684 CommonsChunkPlugin\u63d2\u4ef6,\u4e5f\u53ef\u4ee5\u4f7f\u7528 html-webpack-externals-plugin\u8fdb\u884c\u57fa\u7840\u5305\u7684\u5206\u79bb<\/p>\n\n\n\n
    CommonsChunkPlugin<\/h3>\n\n\n\n
    chunk\u53c2\u6570\u8bf4\u660e<\/p>\n\n\n\n
    \u53c2\u6570<\/th>\u8bf4\u660e<\/th><\/tr><\/thead>
    .async<\/td>\u5f02\u6b65\u5f15\u5165\u7684\u5e93\u8fdb\u884c\u5206\u79bb(\u9ed8\u8ba4)<\/td><\/tr>
    .initial<\/td>\u540c\u6b65\u5f15\u5165\u7684\u5e93\u8fdb\u884c\u5206\u79bb<\/td><\/tr>
    .all<\/td>\u6240\u6709\u5f15\u5165\u7684\u5e93\u8fdb\u884c\u5206\u79bb(\u63a8\u8350)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u6253\u5305\u57fa\u7840\u5305\u5206\u79bb<\/h4>\n\n\n\n
    module.exports = {
        \/\/ \u9700\u8981\u5728HtmlWebpackPlugin\u7684chunks\u4e2d\u52a0\u5165'vendors'
        optimization:{
            splitChunks:{
              cacheGroups:{
                commons:{
                  test:\/(react|react-dom)\/,
                  name:'vendors',
                  chunks:'all'
                }
              }
            }
        }
    }<\/code><\/pre>\n\n\n\n
    \u6253\u5305\u5206\u79bb\u516c\u5171\u4ee3\u7801<\/h4>\n\n\n\n
    module.exports = {
        \/\/ \u9700\u8981\u5728HtmlWebpackPlugin\u7684chunks\u4e2d\u52a0\u5165'commons'
        optimization:{
            splitChunks:{
                minSize:0, \/\/ \u9700\u8981\u5206\u79bb\u7684\u6587\u4ef6\u5927\u5c0f
                cacheGroups:{
                    commons:{
                        name: 'commons',
                        chunks: 'all',
                        minChunks: 2, \/\/ \u6587\u4ef6\u5f15\u5165\u7684\u6570\u91cf
                    }
                }
                
            }
        }
    }<\/code><\/pre>\n\n\n\n
    html-webpack-externals-plugin<\/h3>\n\n\n\n
    \u5b89\u88c5<\/p>\n\n\n\n
    npm install html-webpack-externals-plugin --save-dev<\/code><\/pre>\n\n\n\n
    \u914d\u7f6e webpack.config.js<\/p>\n\n\n\n
    const HtmlWebpackExternalsPlugin = require(\"html-webpack-externals-plugin\")
    module.exports = {
        plugins:[
            new HtmlWebpackExternalsPlugin({
              externals: [
                {
                  module: 'react',
                  entry: 'https:\/\/now8.gtimg.com\/now\/lib\/16.2.0\/react.min.js',
                  global: 'React',
                },
                {
                  module: 'react-dom',
                  entry: 'https:\/\/now8.gtimg.com\/now\/lib\/16.2.0\/react-dom.min.js',
                  global: 'ReactDOM',
                },
              ],
            })
        ]
    }<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    tree shaking (\u6447\u6811\u4f18\u5316)<\/h2>\n\n\n\n
    \u4e00\u4e2a\u6a21\u5757\u53ef\u80fd\u6709\u591a\u4e2a\u65b9\u6cd5,\u53ea\u8981\u5176\u4e2d\u7684\u67d0\u4e2a\u65b9\u6cd5\u88ab\u4f7f\u7528,\u5219\u6574\u4e2a\u6587\u4ef6\u90fd\u4f1a\u88ab\u6253\u5305, \u4f7f\u7528 tree shaking \u53ea\u4f1a\u628a\u7528\u5230\u7684\u65b9\u6cd5\u8fdb\u884c\u6253\u5305, \u5176\u4ed6\u65b9\u6cd5\u4f1a\u88ab\u64e6\u9664. \uff08\u6ce8\u610f\uff1a\u5fc5\u987b\u662fES6\u7684\u8bed\u6cd5\uff09<\/strong><\/p>\n\n\n\n
    webpack \u5728 production \u6a21\u5f0f\u4e0b\u81ea\u52a8\u5f00\u542f tree-shaking<\/p>\n\n\n\n
    \u914d\u7f6e .babelrc \u6587\u4ef6<\/p>\n\n\n\n
    {
        \"modules\":false
    }<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    scope hoisting<\/h2>\n\n\n\n
    \u73b0\u8c61\uff1a webpack\u5728\u6784\u5efa\u4ee3\u7801\u7684\u65f6\u5019\u662f\u4f1a\u5b58\u5728\u5927\u91cf\u7684\u95ed\u5305\u4ee3\u7801\uff0c \u8fd9\u4e9b\u95ed\u5305\u4f1a\u5bfc\u81f4\u6784\u5efa\u6587\u4ef6\u4f53\u79ef\u589e\u5927\uff0c\u51fd\u6570\u4f5c\u7528\u57df\u53d8\u591a\uff0c\u5185\u5b58\u5f00\u9500\u4e5f\u4f1a\u589e\u5927\u3002<\/p>\n\n\n\n
    \u89e3\u51b3\uff1a\u4f7f\u7528scopr hoisting<\/p>\n\n\n\n
    \u539f\u7406\uff1a\u5c06\u6240\u6709\u7684\u6a21\u5757\u4ee3\u7801\u6309\u7167\u5f15\u5165\u987a\u5e8f\u653e\u5728\u4e00\u4e2a\u51fd\u6570\u4f5c\u7528\u57df\u91cc\uff0c\u7136\u540e\u9002\u5f53\u7684\u91cd\u547d\u540d\u4e00\u4e9b\u53d8\u91cf\u4e00\u9632\u6b62\u53d8\u91cf\u540d\u51b2\u7a81\uff1b \u901a\u8fc7 scopr hoidting\u53ef\u4ee5\u51cf\u5c11\u51fd\u6570\u58f0\u660e\u4ee3\u7801\u548c\u5185\u5b58\u7684\u5f00\u9500 \uff08\u6ce8\u610f\uff1a\u5fc5\u987b\u662fES6\u7684\u8bed\u6cd5\uff09<\/strong><\/p>\n\n\n\n
    \u4f7f\u7528\uff1awebpack4\u4ee5\u4e0a \u5728 production \u6a21\u5f0f\u4e0b\u81ea\u52a8\u5f00\u542f<\/p>\n\n\n\n
    \u5728 webpack3 \u4e2d\u9700\u8981\u5728 webpack.config \u4e2d\u914d\u7f6e<\/p>\n\n\n\n
    module.exports = {
        plugins:[
            new webpack.optimize.ModuleConcatenationPlugin()
        ]
    }<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u4ee3\u7801\u5206\u5272\u548c\u52a8\u6001 import<\/h2>\n\n\n\n
    \u5bf9\u4e8e\u8f83\u5927\u7684 web \u5e94\u7528\u6765\u8bb2\uff0c\u5c06\u6240\u6709\u7684\u4ee3\u7801\u90fd\u5728\u653e\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\u662f\u4e0d\u591f\u6709\u6548\u7684\uff0c\u7279\u522b\u662f\u5f53\u67d0\u4e9b\u4ee3\u7801\u5feb\u662f\u5728\u67d0\u4e9b\u7279\u6b8a\u7684\u65f6\u5019\u624d\u4f1a\u88ab\u4f7f\u7528\u5230\u7684\u65f6\u5019\u3002webpack \u63d0\u4f9b\u4e86\u5c06\u4ee3\u7801\u5206\u5272\u6210 chunks\uff08\u8bed\u5757\uff09\uff0c\u5f53\u4ee3\u7801\u8fd0\u884c\u5230\u9700\u8981\u4ed6\u4eec\u7684\u65f6\u5019\u5728\u8fdb\u884c\u52a0\u8f7d\u3002<\/p>\n\n\n\n