Question

我运行服务器localhost并收到错误 bundle.js：1未捕获的SyntaxError：意外的令牌＆lt; 在输出bundle.js是index.html文件的html代码。这是设置我的webpack.config文件。你能告诉我设置有什么问题吗？

import path from 'path';
import webpack from 'webpack';

export default {
  devtool: 'eval-source-map',
  entry: [
    'webpack-hot-middleware/client',
    path.join(__dirname, '/client/index.js' )
    ],
  output: {
    path: '/',
    publicPath: '/'
  },
  plugins: [
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ],
  module: {
    loaders: [
      {
        test: /\.js$/,
        include: path.join(__dirname, 'client'),
        loaders: ['react-hot-loader', 'babel-loader' ]
      }
    ]
  },
  resolve: {
    extensions: ['.js']
  }    
}

的index.html

<html>

 <head>
   <meta charset="UTF-8">
   <title>Site</title>
   <meta content="width=device-width, initial-scale=1" name="viewport" />
 </head>

 <body>
   <h1>Hello bla bla bla</h1>
   <div id="app"></div>

   <script src="bundle.js"></script>
 </body>

 </html>

服务器/ index.js

import express from 'express';
import path from 'path';

import webpack from 'webpack';
import webpackMiddeleware from 'webpack-dev-middleware';
import webpackHotMiddleware from 'webpack-hot-middleware';
import webpackConfig from '../webpack.config';


let app = express();

const compiler = webpack(webpackConfig);

app.use(webpackMiddeleware(compiler, {
  hot: true,
  publicPath: webpackConfig.output.publicPath,
  noInfo: true
}));
app.use(webpackHotMiddleware(compiler));

app.get('/*', (req, res)=>{
  res.sendFile(path.join(__dirname, './index.html'));
});

app.listen('3000', ()=>{console.log('Running on port 3000')});

的客户机/ index.js

import React from 'react';
import { render } from 'react-dom';
import App from './components/App';

render(<App/>, document.getElementById('app'));

组件/ App.js

import React from 'react';

class App extends React.Component {
  render(){
    return (
      <h1>Hello</h1>
    );
  }
}

export default App;

的package.json：

{
  "name": "xxxxx",
  "version": "1.0.0",
  "description": "xxxxxxxxxx",
  "main": "index.js",
  "scripts": {
    "server": "nodemon --watch server --exec babel-node -- server/index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "xxxxxxxxxxxxx"
  },
  "keywords": [
    "
  ],
  "author": "xxxxxxxxx",
  "license": "ISC",
  "bugs": {
    "url": "xxxxxxxxxxxxxxxxxxxxxxx"
  },
  "homepage": "xxxxxxxxxxxxxxxxxxxx",
  "dependencies": {
    "babel-cli": "^6.24.1",
    "express": "^4.15.3",
    "react": "^15.5.4",
    "react-dom": "^15.5.4"
  },
  "devDependencies": {
    "babel-loader": "^7.0.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "nodemon": "^1.11.0",
    "react-hot-loader": "^1.3.1",
    "webpack": "^2.6.1",
    "webpack-dev-middleware": "^1.10.2",
    "webpack-hot-middleware": "^2.18.0"
  }
}

.babelrc

{
  "presets": [ "es2015", "react" ]
}

谢谢。

Answer 1

bundle.js标记中的script src错误。它将返回您的主index.html，这就是您收到该错误的原因 - JS解析器正在尝试解析HTML文件。

您必须在脚本src中添加斜杠： <script src="/bundle.js"></script>

如果这不起作用，您必须仔细检查output配置。

Answer 2

您正在使用多个入口点但未设置输出。

https://github.com/webpack/docs/wiki/configuration#entry

Answer 3

我最终将显式路径放置到index.html中的bundle.js文件中：

来自： <script src="bundle.js"></script>

至： <script src="public/bundle.js"></script>

Answer 4

Webpack 5.46.0 版中针对此问题的一个可能修复。节点 14.x。我发布此信息是希望帮助其他人，如果他们到达此地并且仍未找到解决方法。因此，与许多其他问题一起，一种可能性是，如果您使用 html-webpack-plugin，其中需要在属性中显式设置 publicPath 属性，而以前的 webpack < 5 版本的情况并非如此插件，据说它从 output/devServer 继承了属性。将属性添加到插件后，它可以在 webpack 5 中使用最新的 html-webpack-plugin。

这是相关的配置。

module.exports = {
  mode: 'development',
entry: ['@babel/polyfill', './config/polyfills', './src/index.js'],
  output: {
    hotUpdateMainFilename: '[id].hot-update.[fullhash].json',
    hotUpdateChunkFilename: '[id].hot-update.[fullhash].js',
    path: resolve(__dirname, '..', 'dist'),
    filename: '[name].[fullhash].js',
  },
  optimization: {
    moduleIds: 'named',
  },
  devtool: 'eval-cheap-module-source-map',
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new HtmlWebpackPlugin({
      hash: true,
      publicPath: '/yourPath',
      template: resolve(__dirname, '..', 'src', 'index.html'),
      alwaysWriteToDisk: true,
    }),
    new HtmlWebpackHarddiskPlugin({
      outputPath: resolve(__dirname, '..', 'dist'),
    }),
  ],
};

Answer 5

我通过向对象输出添加filename项来解决了这个问题：

output: {
 path: '/',
 filename: 'bundle.js'
},

Webpack error bundle.js：1 Uncaught SyntaxError：意外的令牌＆lt;

5 个答案: