Javascript Webpack和React--意外标记_Javascript_Reactjs_Webpack_React Dom

Javascript Webpack和React--意外标记

javascript reactjs webpack

Javascript Webpack和React--意外标记,javascript,reactjs,webpack,react-dom,Javascript,Reactjs,Webpack,React Dom,我是新的反应和网页包。我正在设置我的第一个项目，当我尝试运行webpack dev服务器时，我的代码没有编译更新下面的答案是正确的。我需要添加'react'到babel装载机预设。您可以在此处查看project的完整源代码：错误： package.json { "name": "redux-todo", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test":

我是新的反应和网页包。我正在设置我的第一个项目，当我尝试运行webpack dev服务器时，我的代码没有编译

更新下面的答案是正确的。我需要添加

'react'

到babel装载机预设。您可以在此处查看project的完整源代码：

错误：

package.json

{
  "name": "redux-todo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/cleechtech/redux-todo.git"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/cleechtech/redux-todo/issues"
  },
  "homepage": "https://github.com/cleechtech/redux-todo#readme",
  "dependencies": {
    "react": "^0.14.8",
    "react-dom": "^0.14.8",
    "react-redux": "^4.4.1",
    "redux": "^3.3.1"
  },
  "devDependencies": {
    "babel-core": "^6.7.4",
    "babel-loader": "^6.2.4",
    "babel-preset-es2015": "^6.6.0",
    "webpack": "^1.12.14"
  }
}

您还需要将

react

预设添加到

babel加载程序

配置中

而且必须在

es2015

  {
    test: /\.js?$/,
    exclude: /(node_modules|bower_components)/,
    loader: 'babel', // 'babel-loader' is also a legal name to reference
    query: {
      presets: ['es2015', 'react']
    }
  }

您遇到的问题是因为babel需要知道如何传输JSX—它应该知道它的语法，而不是现成的

正如评论中提到的，您还必须安装

babel preset react

npm软件包（这是显而易见的，因为babel会在第一次运行时告诉您）

参考资料：

他可能还需要安装

babel

。这就解决了问题！勇敢的js开发新世界。谢谢（

npm i babel preset react--save dev

）和预置

var React = require('react');

var App = React.createClass({
  render: function() {
    return (
        <div>
            <h1>I am app!</h1>
        </div>
    );
  }
});

console.log(App);

module.exports = App;

<!doctype html>
<head>
    <title>Redux todo</title>
</head>
<body>
    <h1>Hello world</h1>

    <div id='root'></div>
    <script src='bundle.js'></script>
</body>

module.exports = {
  // starting point
  entry: [
    './src/index.js'
  ],
  module: {
    loaders: [
      {
        test: /\.js?$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel', // 'babel-loader' is also a legal name to reference
        query: {
          presets: ['es2015']
        }
      }
    ]
  },
  resolve: {
    extensions: ['', '.js', '.jsx']
  },
  // create bundle.js file
  output: {
    path: __dirname + '/dist',
    publicPath: '/',
    filename: 'bundle.js'
  },
  devServer: {
    contentBase: './dist'
  }
};

{
  "name": "redux-todo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/cleechtech/redux-todo.git"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/cleechtech/redux-todo/issues"
  },
  "homepage": "https://github.com/cleechtech/redux-todo#readme",
  "dependencies": {
    "react": "^0.14.8",
    "react-dom": "^0.14.8",
    "react-redux": "^4.4.1",
    "redux": "^3.3.1"
  },
  "devDependencies": {
    "babel-core": "^6.7.4",
    "babel-loader": "^6.2.4",
    "babel-preset-es2015": "^6.6.0",
    "webpack": "^1.12.14"
  }
}

  {
    test: /\.js?$/,
    exclude: /(node_modules|bower_components)/,
    loader: 'babel', // 'babel-loader' is also a legal name to reference
    query: {
      presets: ['es2015', 'react']
    }
  }