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【已解决】webpack-dev-server出错:localhost无法加载bundle.js

Webpack crifan 1696浏览 0评论

折腾:

【已解决】webpack-dev-server运行后打开页面出错:Cannot GET /

期间,对于配置:

react-hot-boilerplate/react-hot-boilerplate/webpack.config.js

var path = require(‘path’);
var webpack = require(‘webpack’);
// const ENV = process.env.NODE_ENV || ‘development’;
var isProd = (process.env.NODE_ENV === ‘production’);
console.log(`process.env.NODE_ENV=${process.env.NODE_ENV}, isProd=${isProd}`);
//process.env.NODE_ENV=development, isProd=false
module.exports = {
  // entry: [
  //   // ‘webpack-hot-middleware/client’,
  //   ‘./src/index.js’,
  //   ‘./src/adminlte_app.js’
  // ],
  entry: {
    index: ‘./src/index.js’,
    vendor : [
      // ‘webpack-hot-middleware/client’,
      ‘./src/adminlte_app.js’
    ],
  },
  output: {
    // path: path.join(__dirname, ‘public’),
    // path: path.join(__dirname, ‘build’),
    path: path.resolve(__dirname, ‘build’),
    // filename: ‘bundle.js’,
    filename: ‘[name].js’,
    // publicPath: ‘/public/’
    publicPath: ‘/public’
    // publicPath: ‘http://localhost:3000/public/’
  },
  plugins: [
    // new webpack.ProvidePlugin({
    //   $: ‘jquery’,
    //   ‘window.jQuery’: ‘jquery’,
    //   jQuery: ‘jquery’,
    //   ‘window.$’: ‘jquery’,
    // }),
    new webpack.optimize.CommonsChunkPlugin({
      name: ‘vendor’,
      filename: ‘vendor.bundle.js’
    }),
    new webpack.HotModuleReplacementPlugin()
    // new webpack.optimize.UglifyJsPlugin({
    //   minimize: true
    // })
  ],
  module: {
    // loaders: [
    rules: [
      {
        test: /\.js$/,
        //loaders: [‘react-hot-loader’, ‘babel-loader’],
        use: [‘react-hot-loader’, ‘babel-loader’],
        // include: path.join(__dirname, ‘src’)
      },
      {
        test: /\.css$/,
        // loaders: [‘style-loader’, ‘css-loader’],
        use: [‘style-loader’, ‘css-loader’],
        // include: path.join(__dirname, ‘src’)
      }
    ]
  },
  // https://webpack.js.org/configuration/devtool/
  // https://doc.webpack-china.org/configuration/devtool/
  devtool: isProd ? ‘cheap-module-source-map’ : ‘eval’,
  // devtool: ‘cheap-module-source-map’,
  // devtool: ‘cheap-module-eval-source-map’,
  //used for webpack-dev-server
  devServer:{
    // contentBase: path.join(__dirname, ‘dist’),
    contentBase: path.resolve(__dirname, ‘build’),
    compress: true,
    port: 3000,
    historyApiFallback: true
   }
};

和代码:

react-hot-boilerplate/react-hot-boilerplate/index.html

  <body class=”skin-blue sidebar-mini wysihtml5-supported”>
    <div id=’root’>
    </div>
    <script src=”https://code.jquery.com/jquery-3.1.1.min.js” integrity=”sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8=” crossorigin=”anonymous”></script>
    
    <!– <script src=”/adminlte_app.js”></script> –>
    <!– <script src=”/public/adminlte_app.js”></script> –>
    <script src=”/public/vendor.bundle.js”></script>
    <!– <script src=”/vendor.bundle.js”></script> –>
    <!– <script src=”vendor.bundle.js”></script> –>
    <script src=”/build/bundle.js”></script>
    <!– <script src=”/public/index.js”></script> –>
    <!– <script src=”/index.js”></script> –>
    <!– <script src=”index.js”></script> –>
    
    <script src=”https://cdnjs.cloudflare.com/ajax/libs/datatables/1.10.15/js/jquery.dataTables.min.js”></script>
    <script src=”https://cdnjs.cloudflare.com/ajax/libs/datatables/1.10.15/js/dataTables.bootstrap.min.js”></script>
  </body>

webpack-dev-server后运行出错:

GET http://localhost:3000/build/bundle.js localhost/:40

参考官网教程:

webpack dev server

去配置:

module.exports = {
  entry: {
    index: ‘./src/index.js’,
    vendor : [
      // ‘webpack-hot-middleware/client’,
      ‘./src/adminlte_app.js’
    ],
  },
  output: {
    // path: path.join(__dirname, ‘public’),
    // path: path.join(__dirname, ‘build’),
    path: path.resolve(__dirname, ‘build’),
    // filename: ‘bundle.js’,
    filename: ‘[name].js’,
    // publicPath: ‘/public/’
    // publicPath: ‘/public’
    publicPath: ‘/assets/’
    // publicPath: ‘http://localhost:3000/public/’
  },
  //used for webpack-dev-server
  devServer:{
    // contentBase: path.join(__dirname, ‘dist’),
    contentBase: path.resolve(__dirname, ‘build’),
    compress: true,
    port: 3000,
    historyApiFallback: true
   }

    <!– <script src=”/adminlte_app.js”></script> –>
    <!– <script src=”/public/adminlte_app.js”></script> –>
    <script src=”assets/vendor.bundle.js”></script>
    <!– <script src=”/vendor.bundle.js”></script> –>
    <!– <script src=”vendor.bundle.js”></script> –>
    <script src=”assets/bundle.js”></script>
    <!– <script src=”/public/index.js”></script> –>
    <!– <script src=”/index.js”></script> –>
    <!– <script src=”index.js”></script> –>

结果问题依旧。

webpack-dev-server  can not get assets/bundle.js

bundled js cannot be found from webpack-dev-server invoked from gulp. · Issue #645 · webpack/webpack-dev-server

给devServer加上:

    publicPath: path.resolve(__dirname, ‘build’),

结果错误有所变化:

Failed to load resource: the server responded with a status of 404 (Not Found)
bundle.js

javascript – bundle.js missing from webpack build when using webpack-dev-server – Stack Overflow

改为:

<code>    &lt;script src="http://localhost:3000/assets/vendor.bundle.js"&gt;&lt;/script&gt;
    &lt;script src="http://localhost:3000/assets/bundle.js"&gt;&lt;/script&gt;
</code>

结果,错误又变成了:

改为:

    //filename: ‘[name].js’,
    filename: ‘./build/[name].js’,

结果,问题依旧。

webpack-dev-server can not load bundle.js

webpack-dev-server 教程

先确认一下webpack-dev-server的最新版本:

➜  react-hot-boilerplate git:(master) ✗ webpack-dev-server –version
webpack-dev-server 2.7.1
webpack 3.5.4
➜  react-hot-boilerplate git:(master) ✗ which webpack-dev-server
/usr/local/bin/webpack-dev-server

webpack 使用教程–实时刷新测试 – 小小平凡世界 – 博客园

webpack-dev-server使用方法,看完还不会的来找我~ – JSer – SegmentFault

Webpack 2 入门教程 | llp的程序猿之路

Webpack-dev-server配置及启用热模块替换 [Webpack教程三]

详解webpack-dev-server的使用_Javascript教程-织梦者

暂时,是:

通过:

package.json

中的:

  “scripts”: {
    “dev”: “cross-env NODE_ENV=development webpack-dev-server –progress –colors –hot –inline –open”,
    “lint”: “eslint src”,
    “build”: “rm -rf build && mkdir -p build && cp index.html build && cross-env NODE_ENV=production webpack -p –progress –colors”
  },

然后去:

➜  react-hot-boilerplate git:(master) ✗ npm run build
> react-hot-boilerplate@1.0.0 build /Users/crifan/dev/dev_root/daryun/Projects/xxx/sourcecode/web/AdminManagement/reference/react-hot-boilerplate/react-hot-boilerplate
> rm -rf build && mkdir -p build && cp index.html build && cross-env NODE_ENV=production webpack -p –progress –colors
process.env.NODE_ENV=production, isProd=true
Hash: 269a5d59a386a36f2e95
Version: webpack 3.5.4
Time: 43045ms
               Asset       Size  Chunks                    Chunk Names
            index.js    1.12 MB       0  [emitted]  [big]  index
    vendor.bundle.js    10.9 kB       1  [emitted]         vendor
        index.js.map  245 bytes       0  [emitted]         index
vendor.bundle.js.map  132 bytes       1  [emitted]         vendor
[207] (webpack)/buildin/module.js 521 bytes {0} [built]
[237] (webpack)/buildin/global.js 823 bytes {0} [built]
[303] ./src/index.js 467 bytes {0} [built]
[392] ./src/App.js 15.3 kB {0} [built]
[757] ./src/app.css 994 bytes {0} [built]
[758] ./node_modules/css-loader!./src/app.css 430 bytes {0} [built]
[762] multi ./src/adminlte_app.js 28 bytes {1} [built]
[763] ./src/adminlte_app.js 22.6 kB {1} [built]
    + 756 hidden modules

从而让build文件夹中有对应的文件了:

然后此处的html中的代码是:

    <script src=”vendor.bundle.js”></script>
    <script src=”index.js”></script>

因此此处访问:

➜  react-hot-boilerplate git:(master) ✗ npm run dev
> react-hot-boilerplate@1.0.0 dev /Users/crifan/dev/dev_root/daryun/Projects/xxx/sourcecode/web/AdminManagement/reference/react-hot-boilerplate/react-hot-boilerplate
> cross-env NODE_ENV=development webpack-dev-server –progress –colors –hot –inline –open
process.env.NODE_ENV=development, isProd=false
10% building modules 2/2 modules 0 active
Project is running at http://localhost:3000/
webpack output is served from /
Content not from webpack is served from /Users/crifan/dev/dev_root/daryun/Projects/xxx/sourcecode/web/AdminManagement/reference/react-hot-boilerplate/react-hot-boilerplate/build
404s will fallback to /index.html
10% building modules 2/6 modules 4 active …ode_modules/webpack/hot/dev-server.jswebpack: wait until bundle finished: /
Hash: f678a8f9f6ad5738e5b0
Version: webpack 3.5.4
Time: 26905ms
           Asset     Size  Chunks                    Chunk Names
        index.js  4.24 MB       0  [emitted]  [big]  index
vendor.bundle.js   418 kB       1  [emitted]  [big]  vendor
  [86] ./node_modules/react/react.js 55 bytes {0} [built]
[138] (webpack)/hot/log.js 1.01 kB {1} [built]
[206] (webpack)-dev-server/client?http://localhost:3000 5.97 kB {1} [built]
[223] (webpack)/hot/dev-server.js 1.59 kB {1} [built]
[347] multi (webpack)-dev-server/client?http://localhost:3000 webpack/hot/dev-server ./src/index.js 52 bytes {0} [built]
[354] ./node_modules/strip-ansi/index.js 161 bytes {1} [built]
[356] ./node_modules/loglevel/lib/loglevel.js 7.43 kB {1} [built]
[357] (webpack)-dev-server/client/socket.js 872 bytes {1} [built]
[388] (webpack)-dev-server/client/overlay.js 3.61 kB {1} [built]
[393] (webpack)/hot nonrecursive ^\.\/log$ 170 bytes {1} [built]
[395] (webpack)/hot/log-apply-result.js 1.3 kB {1} [built]
[396] ./src/index.js 467 bytes {0} [built]
[408] ./node_modules/react-dom/index.js 58 bytes {0} [built]
[870] multi (webpack)-dev-server/client?http://localhost:3000 webpack/hot/dev-server ./src/adminlte_app.js 52 bytes {1} [built]
[871] ./src/adminlte_app.js 22.6 kB {1} [built]
    + 857 hidden modules
webpack: Compiled successfully.

后去访问:

http://localhost:3000/

可以正常加载页面:

但是,没搞错的话,能加载页面的前提是此处的build文件夹有prodcution生成的文件了。

而不是webpack-dev-server在内存中生成的文件啊。

所以再去改为:

    <script src=”http://localhost:3000/vendor.bundle.js”></script>
    <script src=”http://localhost:3000/bundle.js”></script>

看看能否正常加载

果然还是找不到:

先不管了。

暂时还是用:

<script src=”vendor.bundle.js”></script>
<script src=”index.js”></script>

后面有问题再说。

【总结】

此处暂时是用:

react-hot-boilerplate/react-hot-boilerplate/package.json

  “scripts”: {
    “dev”: “cross-env NODE_ENV=development webpack-dev-server –progress –colors –hot –inline –open”,
    “lint”: “eslint src”,
    “build”: “rm -rf build && mkdir -p build && cp index.html build && cross-env NODE_ENV=production webpack -p –progress –colors”
  },

然后先去执行了一遍:

npm run build

在本地的build文件夹中生成了对应的:

vendor.bundle.js

index.js

然后再去:

npm run dev

结果,对于html中:

<script src=”vendor.bundle.js”></script>
<script src=”index.js”></script>

暂时是可以加载的,但是感觉是加载的本地文件,而非webpack-dev-server的内存中的文件。

先这么用,后面出问题再说。

【后记】

经过后来的折腾,总算是明白了:

【整理】webpack中output的path和publicPath和webpack-dev-server的devServer的contentBase和publicPath的区别和作用

转载请注明:在路上 » 【已解决】webpack-dev-server出错:localhost无法加载bundle.js

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