webpack + vuecli多頁面打包基于（vue-template-admin）修改-有解無憂

遇見的問題TypeError: Cannot read property ‘tap’ of undefined

先看專案目錄結構：關于專案的修改及改造再專案完事的時候會發布的

在這里插入圖片描述

如果你也遇見這個問題的話這一篇博客應該完全可以解決
問題描述：

building for sit environment...D:\EVDownload\adminMPA\node_modules\script-ext-html-webpack-plugin\lib\plugin.js:50
      compilation.hooks.htmlWebpackPluginAlterAssetTags.tap(PLUGIN, alterAssetTags);
                                                        ^

TypeError: Cannot read property 'tap' of undefined
    at ScriptExtHtmlWebpackPlugin.compilationCallback (D:\EVDownload\adminMPA\node_modules\script-ext-html-webpack-plugin\lib\plugin.js:50:57)
    at SyncHook.eval [as call] (eval at create (D:\EVDownload\adminMPA\node_modules\tapable\lib\HookCodeFactory.js:19:10), <anonymous>:11:1)
    at SyncHook.lazyCompileHook (D:\EVDownload\adminMPA\node_modules\tapable\lib\Hook.js:154:20)
    at Compiler.newCompilation (D:\EVDownload\adminMPA\node_modules\webpack\lib\Compiler.js:504:26)
    at D:\EVDownload\adminMPA\node_modules\webpack\lib\Compiler.js:540:29
    at AsyncSeriesHook.eval [as callAsync] (eval at create (D:\EVDownload\adminMPA\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:6:1)
    at AsyncSeriesHook.lazyCompileHook (D:\EVDownload\adminMPA\node_modules\tapable\lib\Hook.js:154:20)
    at Compiler.compile (D:\EVDownload\adminMPA\node_modules\webpack\lib\Compiler.js:535:28)
    at D:\EVDownload\adminMPA\node_modules\webpack\lib\Compiler.js:274:11
    at Compiler.readRecords (D:\EVDownload\adminMPA\node_modules\webpack\lib\Compiler.js:402:11)
    at D:\EVDownload\adminMPA\node_modules\webpack\lib\Compiler.js:271:10
    at AsyncSeriesHook.eval [as callAsync] (eval at create (D:\EVDownload\adminMPA\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:6:1)
    at AsyncSeriesHook.lazyCompileHook (D:\EVDownload\adminMPA\node_modules\tapable\lib\Hook.js:154:20)
    at D:\EVDownload\adminMPA\node_modules\webpack\lib\Compiler.js:268:19
    at AsyncSeriesHook.eval [as callAsync] (eval at create (D:\EVDownload\adminMPA\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:15:1)
    at AsyncSeriesHook.lazyCompileHook (D:\EVDownload\adminMPA\node_modules\tapable\lib\Hook.js:154:20)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! admin@1.0.0 build:sit: `cross-env NODE_ENV=production env_config=sit node build/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the admin@1.0.0 build:sit script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\l\AppData\Roaming\npm-cache\_logs\2020-11-10T02_45_03_911Z-debug.log

這個問題全網只有兩個人寫過博客但是不適合我這個（我也不知道為啥）
如果你也有這樣的問題可以嘗試下：
第一篇博客解決辦法發是 webpack 和 webpackServe 及 html-webpack-plugin 版本沖突這個直接去重寫install 個版本就好了
博客鏈接： https://blog.csdn.net/qq_31290307/article/details/86158770
第二篇博客解決辦法如下：
set “html-webpack-plugin”: “^4.0.0-alpha” => “4.0.0-alpha”
remove node_modules
remove package-lock.json
npm install
博客鏈接： https://www.cnblogs.com/ybz94/p/9625864.html

以上兩篇博客如果還不能解決你的問題那你就跟著我走吧！以下是我的解決思路
第一點：檢查入口檔案是不是有多余的東西
列印結果如下：
在這里插入圖片描述
對比圖

在這里我們發現入口檔案多了幾個js 分別是 errorLog.js 和 permission.js
所以我們要做的操作是將多余的js洗掉
入口函式寫法如下

//多入口配置
// 通過glob模塊讀取views檔案夾下的所有對應檔案夾下的js后綴檔案，如果該檔案存在
// 那么就作為入口處理
exports.entries = function() {
  var entryFiles = glob.sync(PAGE_PATH + '/*/*.js')
  // console.log(entryFiles ,'entryCha')
  var map = {}
  entryFiles.forEach((filePath) => {
        var filename = filePath.substring(filePath.lastIndexOf('\/') + 1, filePath.lastIndexOf('.'))
        map[filename] = filePath
  })
  delete map.errorLog ;
  delete map.permission ;

  console.log(map ,'map')
  return map
}

修改完入口檔案后我再次打包發現問題依舊，別灰心繼續搞， webpack 打包主要就是入口和出口接下來我們研究下出口檔案函式我一開始寫法如下：

//多頁面輸出配置
// 與上面的多頁面入口配置相同，讀取pages檔案夾下的對應的html后綴檔案，然后放入陣列中
exports.htmlPlugin = function() {
  // let entryHtml = path.resolve(__dirname + '../dist/*.html')
  let entryHtml = glob.sync(PAGE_PATH + '/*/*.html')
  let arr = []
  entryHtml.forEach((filePath) => {
      let filename = filePath.substring(filePath.lastIndexOf('\/') + 1, filePath.lastIndexOf('.'))
      let conf = {
          // 模板來源
          template: filePath,
          // 檔案名稱
          filename: filename + '.html',
          // 頁面模板需要加對應的js腳本，如果不加這行則每個頁面都會引入所有的js腳本
          chunks: ['manifest', 'vendor', filename],
          inject: true,
          templateParameters: {
                BASE_URL: config.build.assetsPublicPath + config.build.assetsSubDirectory,
              },
      }
      if (process.env.NODE_ENV === 'production') {
          conf = merge(conf, {
              minify: {
                  removeComments: true,
                  collapseWhitespace: true,
                  removeAttributeQuotes: true
              },
              chunksSortMode: 'dependency'
          })
      }
      arr.push(new HtmlWebpackPlugin(conf))
  })
  console.log(arr , 'arr')
  return arr
}

我們看下列印的資料對不對

[
  HtmlWebpackPlugin {
    options: {
      template: 'D:/EVDownload/adminMPA/src/views/index/index.html',
      templateContent: false,
      templateParameters: [Object],
      filename: 'index.html',
      hash: false,
      inject: true,
      compile: true,
      favicon: false,
      minify: false,
      cache: true,
      showErrors: true,
      chunks: [Array],
      excludeChunks: [],
      chunksSortMode: 'auto',
      meta: {},
      title: 'Webpack App',
      xhtml: false
    },
    childCompilerHash: undefined,
    childCompilationOutputName: undefined,
    assetJson: undefined,
    hash: undefined,
    version: 4
  },
  HtmlWebpackPlugin {
    options: {
      template: 'D:/EVDownload/adminMPA/src/views/page/page.html',
      templateContent: false,
      templateParameters: [Object],
      filename: 'page.html',
      hash: false,
      inject: true,
      compile: true,
      favicon: false,
      minify: false,
      cache: true,
      showErrors: true,
      chunks: [Array],
      excludeChunks: [],
      chunksSortMode: 'auto',
      meta: {},
      title: 'Webpack App',
      xhtml: false
    },
    childCompilerHash: undefined,
    childCompilationOutputName: undefined,
    assetJson: undefined,
    hash: undefined,
    version: 4
  },
  HtmlWebpackPlugin {
    options: {
      template: 'D:/EVDownload/adminMPA/src/views/pagetwo/pagetwo.html',
      templateContent: false,
      templateParameters: [Object],
      filename: 'pagetwo.html',
      hash: false,
      inject: true,
      compile: true,
      favicon: false,
      minify: false,
      cache: true,
      showErrors: true,
      chunks: [Array],
      excludeChunks: [],
      chunksSortMode: 'auto',
      meta: {},
      title: 'Webpack App',
      xhtml: false
    },
    childCompilerHash: undefined,
    childCompilationOutputName: undefined,
    assetJson: undefined,
    hash: undefined,
    version: 4
  }
]

仔細瞅了一下，也沒有大問題，但是當我打開config檔案時發現我在這里竟然也設定了build路徑【奔潰】，那么再重新修改下打包路徑吧，
第一步在 webpack.dev.conf.js 里修改

 plugins: [
    new webpack.DefinePlugin({
      'process.env': require('../config/dev.env')
    }),
    new webpack.HotModuleReplacementPlugin(),
    /* 在這開始插入代碼*********************************************************/

    new htmlWebpackPlugin({
      filename : 'index.html',//輸出的html路徑
      template : 'index.html', //html模板路徑
      //inject : 'head',  //js檔案在head中，若為body則在body中
      inject : true,
      title : 'index',
      chunks : ['app'], //打包時只打包main和a的js檔案，見entry，注意使用chunks時模板index.html檔案里面不允許有script標簽，即使注釋掉也會報錯
      templateParameters: {
        BASE_URL: config.dev.assetsPublicPath + config.dev.assetsSubDirectory
      }
    }),
    
  new htmlWebpackPlugin({
    filename : 'page.html',//輸出的html路徑
    template : 'page.html', //html模板路徑
    //inject : 'head',  //js檔案在head中，若為body則在body中
    inject : true,
    title : 'page',
    chunks : ['page'], //打包時只打包main和a的js檔案，見entry，注意使用chunks時模板index.html檔案里面不允許有script標簽，即使注釋掉也會報錯
    templateParameters: {
      BASE_URL: config.dev.assetsPublicPath + config.dev.assetsSubDirectory
    }
  }),
  new htmlWebpackPlugin({
    filename : 'pagetwo.html',//輸出的html路徑
    template : 'pagetwo.html', //html模板路徑
    //inject : 'head',  //js檔案在head中，若為body則在body中
    inject : true,
    title : 'pagetwo',
    chunks : ['pagetwo'], //打包時只打包main和a的js檔案，見entry，注意使用chunks時模板index.html檔案里面不允許有script標簽，即使注釋掉也會報錯
    templateParameters: {
      BASE_URL: config.dev.assetsPublicPath + config.dev.assetsSubDirectory
    }
  }),
  /* 在這結束插入代碼*********************************************************/

    new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.
    new webpack.NoEmitOnErrorsPlugin(),
    new CopyWebpackPlugin([
      {
        from: path.resolve(__dirname, '../static'),
        to: config.dev.assetsSubDirectory,
        ignore: ['.*']
      }
    ])
   
  ]
})

因為我這有三個動態專案目前插如三個 new htmlWebpackPlugin

在webpack.prod.conf.js 里修改如下

 plugins: [
    // http://vuejs.github.io/vue-loader/en/workflow/production.html
    new webpack.DefinePlugin({
      'process.env': env
    }),
    // extract css into its own file
    new MiniCssExtractPlugin({
      filename: utils.assetsPath('css/[name].[contenthash:8].css'),
      chunkFilename: utils.assetsPath('css/[name].[contenthash:8].css')
    }),
    /* 開始插入代碼 ************************************************/
    new HtmlWebpackPlugin({
      filename: config.build.app,
      template: 'index.html',
      inject: true,
      favicon: resolve('favicon.ico'),
      title: 'index',
      templateParameters: {
        BASE_URL: config.build.assetsPublicPath + config.build.assetsSubDirectory
      },
      chunks: ['manifest', 'vendor', 'app'],
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
        // more options:
        // https://github.com/kangax/html-minifier#options-quick-reference
      }
      // default sort mode uses toposort which cannot handle cyclic deps
      // in certain cases, and in webpack 4, chunk order in HTML doesn't
      // matter anyway

    }),
    new HtmlWebpackPlugin({
      filename: config.build.page,
      template: 'page.html',
      inject: true,
      favicon: resolve('favicon.ico'),
      title: 'page',
      templateParameters: {
        BASE_URL: config.build.assetsPublicPath + config.build.assetsSubDirectory
      },
      chunks: ['manifest', 'vendor', 'page'],
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
        // more options:
        // https://github.com/kangax/html-minifier#options-quick-reference
      }
      // default sort mode uses toposort which cannot handle cyclic deps
      // in certain cases, and in webpack 4, chunk order in HTML doesn't
      // matter anyway

    }),
    new HtmlWebpackPlugin({
      filename: config.build.pagetwo,
      template: 'pagetwo.html',
      inject: true,
      favicon: resolve('favicon.ico'),
      title: 'pagetwo',
      templateParameters: {
        BASE_URL: config.build.assetsPublicPath + config.build.assetsSubDirectory
      },
      chunks: ['manifest', 'vendor', 'pagetwo'],
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
        // more options:
        // https://github.com/kangax/html-minifier#options-quick-reference
      }
      // default sort mode uses toposort which cannot handle cyclic deps
      // in certain cases, and in webpack 4, chunk order in HTML doesn't
      // matter anyway

    }),
      /* 結束插入代碼 ************************************************/
    new ScriptExtHtmlWebpackPlugin({
      //`runtime` must same as runtimeChunk name. default is `runtime`
      inline: /runtime\..*\.js$/
    }),
    // keep chunk.id stable when chunk has no name
    new webpack.NamedChunksPlugin(chunk => {
      if (chunk.name) {
        return chunk.name
      }
      const modules = Array.from(chunk.modulesIterable)
      if (modules.length > 1) {
        const hash = require('hash-sum')
        const joinedHash = hash(modules.map(m => m.id).join('_'))
        let len = nameLength
        while (seen.has(joinedHash.substr(0, len))) len++
        seen.add(joinedHash.substr(0, len))
        return `chunk-${joinedHash.substr(0, len)}`
      } else {
        return modules[0].id
      }
    }),
    // keep module.id stable when vender modules does not change
    new webpack.HashedModuleIdsPlugin(),
    // copy custom static assets
    new CopyWebpackPlugin([
      {
        from: path.resolve(__dirname, '../static'),
        to: config.build.assetsSubDirectory,
        ignore: ['.*']
      }
    ])
  ] ,

在這里也插入代碼（注釋里有標記哦！！！！！！！！！！！）
好了現在在運行下吧看看效果咋樣呢？
在這里插入圖片描述
打包完成成功啦！

小記
這個bug 說白了問題的根點在出口檔案這，為什么會在這呢 ? 相關檔案有說是因為 webpack 新增 hook 屬性造成的看的我迷迷糊糊的沒明白大致就是說你的出口檔案應該怎么設定啥的，哎！腦殼疼
為什么出口檔案不能放在公共的utils 里呢？目前這樣打包問題雖然解決但是每次的修改過于復雜（腦殼疼），如果有大神的話感謝指導下哈！！！后期我會把這個專案開源詳細請到個人中心查看
再此特別鳴謝 @璠哥（一個溫文爾雅的漂亮妹子） @勁琪（一個陽光帥氣的小帥哥）

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