react整合webpack 亲测可用

先把webpack安装成全局的 
npm --registry http://r.cnpmjs.org install webpack -g
然后初始化package.json
npm init
然后安装webpack和react等插件
npm --registry http://r.cnpmjs.org i babel-core babel-loader babel-preset-es2015 babel-preset-react react react-dom webpack webpack-dev-server  --save-dev

然后根据需要搭建目录
然后配置webpack的配置文件webpack.config.js文件
module.exports = {
  entry: [
    './src/index.js'
  ],
  output: {
    path: __dirname,
    publicPath: '/',
    filename: 'bundle.js'
  },
  module: {
    loaders: [{
      exclude: /node_modules/,
      loader: 'babel'
    }]
  },
  resolve: {
    extensions: ['', '.js', '.jsx']
  },
  devServer: {
    historyApiFallback: true,
    contentBase: './'