下面是我的 webpack.config.js 代码

var webpack = require('webpack');
var path = require('path');

module.exports = {
    // context: __dirname + "/app",
   entry: [
    'webpack-dev-server/client?http://0.0.0.0:8080',
    'webpack/hot/only-dev-server',
     './src/main.jsx'],
    output: {
        path: "./build",
        filename: "main.js"
    },
    module: {
      loaders: [
        {
          test: /\.jsx?$/,
          exclude: /(node_modules|bower_components)/,
          loaders:  ['react-hot', 'babel'],
          include: path.join(__dirname, 'build'),
          query:
            {
              presets:['es2015', 'react']
            },
          plugins: [
            new webpack.HotModuleReplacementPlugin()
          ]
        }
      ]
    }
}

这是我的 package.son 的脚本代码

  "scripts": {
  "test": "echo \"Error: no test specified\" && exit 1",
  "build": "webpack",
  "dev": "webpack-dev-server --devtool eval --progress --colors --hot --content-base build"
  },

这是我的 main.js 代码

var React = require('react');
var ReactDOM = require('react-dom');

ReactDOM.render(
  <h1>Hello World!</h1>,
  document.getElementById('example')
);

当我输入 "npm run dev" 时，出现此错误

ERROR in ./src/main.jsx
Module parse failed: /Users/testaccount/Documents/React/test-react/src/main.jsx Line 6: Unexpected token <
You may need an appropriate loader to handle this file type.
| 
| ReactDOM.render(
|   <h1>Hello World!</h1>,
|   document.getElementById('example')
| );
 @ multi main

我去 localhost:8080 没有任何显示。有谁知道发生了什么？为什么我的 react-hot-loader 不起作用？