当我在webpack-dev-server运行时修改我的文件时，bundle的文件没有更新。下面是我的webpack.config.js和package.json文件，正如你从我的npm脚本中看到的，我已经解决了在同一个命令（npm run watch & webpack-dev-server --content-base ./ --port 9966）中运行webpack watch和webpack-dev-server的问题：
webpack.config.js:

'use strict';

var ReactStylePlugin = require('react-style-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');

var webpack = require('webpack');

module.exports = {
    devtool: 'sourcemap',
  entry: ['./js/main.js'],
  output: {
    filename: 'bundle.js',
    path: __dirname + '/assets',
    publicPath: __dirname + '/'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loaders: [
          ReactStylePlugin.loader(),
          'jsx-loader?harmony'
        ]
      },
      {
        test: /\.css$/,
        loader: ExtractTextPlugin.extract('css-loader')
      }
    ]
  },
  plugins: [
    new ReactStylePlugin('bundle.css'),
    new webpack.DefinePlugin({
      'process.env': {
        // To enable production mode:
        //NODE_ENV: JSON.stringify('production')
      }
    })
  ]
}

package.json:

{
  "name": "reactTest",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "watch": "webpack --watch",
    "build": "webpack",
    "web": "npm run watch &  webpack-dev-server --content-base ./ --port 9966"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "css-loader": "^0.10.1",
    "extract-text-webpack-plugin": "^0.3.8",
    "jsx-loader": "^0.13.1",
    "react-style-webpack-plugin": "^0.4.0",
    "style-loader": "^0.10.2",
    "url-loader": "^0.5.5",
    "webpack": "^1.8.5",
    "webpack-dev-server": "^1.8.0"
  },
  "dependencies": {
    "react": "^0.13.1",
    "react-style": "^0.5.3"
  }
}

我目录结构是：

assets  
  bundle.css
  bundle.css.map    
  bundle.js 
  bundle.js.map 
js
  AppActions.js
  Profile.css.js
  ProfileList.js
  main.js
  AppConstants.js
  AppStore.js       
  Profile.js
  ResultPage.js     
package.json
index.html
node_modules
webpack.config.js

assets目录中的每个文件都由webpack生成