parsing - React - 模块解析失败

Question

从命令行运行 webpack 时，我一整天都遇到此错误:

ERROR in ./index.js
Module parse failed: /home/kuro/Workspace/ExpressJS/corate/src/index.js Line 10: Unexpected token <
You may need an appropriate loader to handle this file type.
|   render:function(){      
|       return (
|           <div>
|               <div className="left">
|                   <img src={mac}/>

这是我在 index.js 中的代码

var React=require('react');
var ReactDOM=require('react-dom');
var style=require('../public/css/style.css');
var mac=require('../public/images/img_landing_page_mac.png');
var chrome=require('../public/images/btn_get_chrome.png');

var Content=React.createClass({
    render:function(){      
        return (
            <div>
                <div className="left">
                    <img src={mac}/>
                </div>
                <div className="right">
                    <h2 style={font-size: '33px', letter-spacing: '5px'}>
                        Organize <br>Modern Knowledge<br> for Mankind
                    </h2>
                    <p style={font-size: '20px', margin-top: '35px', letter-spacing: '4px'}>
                        Consume, Colect and Revisit <br>Knowledge at Your Fingertips
                    </p>
                    <a href="#" style={margin-top: '80px', display: 'inline-block', margin-left: '-17px'}>
                        <img src={chrome}/>
                    </a>
                </div>
            </div>
        );
    }
});

ReactDOM.render(<Content/>,document.getElementByClassName('container'));

以及webpack.config.js中的配置:

module.exports={
    context: __dirname+'/src',
    entry:'./index.js',
    output:{
        path:__dirname+'/static',
        filename:'bundle.js'
    },
    module:{
        loaders:[
        {
            test:/\.png$/,
            loader:'url?limit=10000'
        },
        {
            test:/\.jpg$/,
            loader:'url?limit=10000'
        },
        {
            test:/\.css$/,
            loader:'style!css'
        }
        ]
    }
}

我无法弄清楚它出了什么问题。我在这里遗漏了什么吗？

Answer 1

您需要添加 babel-loader ，与 react preset ，执行以下步骤

1. npm i --save-dev babel-loader babel-preset-react babel-preset-es2015

2. 添加到webpack.config.js babel-loader的配置(至 loaders: [..] 部分)

   {  
      test: /\.jsx?$/,
      exclude: /(node_modules)/,
      loader: 'babel',
      query: {
         presets: ['react', 'es2015']
      }
   }
   

更新: babel-preset-es2015 , babel-preset-react已弃用，转而使用 @babel/env 和@babel/preset-react

1. npm i --save-dev babel-loader @babel/core @babel/preset-react @babel/preset-env
2. 添加到webpack.config.js babel-loader的配置

  rules: [
    {
      test: /\.jsx?$/,
      exclude: /(node_modules)/,
      use: {
        loader: 'babel-loader',
        options: {
          presets: ['@babel/preset-env', '@babel/preset-react']
        }
      }
    }
  ]