实现热更新，首先，安装一系列的node命令，如果嫌麻烦，你可以直接看解决方案二，相对来说比较简单。
1、webpack命令安装
npm install webpack -g npm init npm init -yes //可以创建默认的package.json npm install webpack --save-dev npm install path fs html-webpack-plugin extract-text-webpack-plugin autoprefixer webpack-dev-server --save-dev npm install css-loader style-loader --save-dev//样式文件，我们需要两种loader，css-loader 和 style－loader，css-loader会遍历css文件，找到所有的url(...)并且处理。style-loader会把所有的样式插入到你页面的一个style tag中。
webpack 使用命令：（知道有这个东西就行，这里不做过多介绍）
webpack --config XXX.js //使用另一份配置文件（比如webpack.config2.js）来打包 webpack --watch //监听变动并自动打包 webpack -p//压缩混淆脚本，这个非常非常重要！ webpack -d//生成map映射文件，告知哪些模块被最终打包到哪里了
其中的 -p 是很重要的参数，曾经一个未压缩的 700kb 的文件，压缩后直接降到 180kb （主要是样式这块一句就独占一行脚本，导致未压缩脚本变得很大） 。
2、webpack 支持es6转码安装
//安装转码规则 npm install babel-core babel-loader babel-preset-es2015 babel-preset-React babel-preset-stage-0 –save-dev
3、webpack + es6 + react 安装命令：
npm install react react-dom react-router react-hot-loader css-loader jsx-loader --save-dev //react-hot-loader 是一款非常好用的 React 热插拔的加载插件，通过它可以实现修改-运行同步的效果，配合 webpack-dev-server 使用更佳！
附注：
css加载不出来的时候或者报错的时候（ERROR Module not found: Error: Cannot resolve module ‘style' in D:\workspace\HBuilder React_Probject\webPack-demo1\webpck\app）
执行这两个命令：
$ npm i style-loader -D $ npm i css-loader -D
只要你按照命令安装，即可实现，接下来我附加上我的实现代码：需要几个文件：
1、package.json文件
在package.json文件中为scripts添加,方便使用命令:
最终package.json文件如下
"scripts": { "start": "node dev-serve.js" },
最终package.json文件如下：
{ "name": "yubai", "description": "Utility components for react js", "version": "1.1.1", "keywords": [ "react-component", "react-utils", "react utility" ], "scripts": { "start": "node dev-serve.js" }, "src": "src", "test": "test", "dist": "dist", "mainInput": "ReactUtils", "mainOutput": "main", "dependencies": { "async": "^0.9.0", "backbone": "^1.1.2", "bootstrap": "^3.2.0", "es6-promise": "^1.0.0", "flux": "^2.0.1", "font-awesome": "^4.2.0", "humps": "0.0.1", "jquery": "^2.1.1", "jquery.ui.widget": "^1.10.3", "json5": "^0.2.0", "less": "^1.7.5", "less-loader": "^0.7.7", "lodash": "^2.4.1", "moment": "^2.8.3", "normalizr": "^0.1.2", "q": "^1.0.1", "react-hot-loader": "^0.4.5", "rimraf": "^2.2.8", "routes": "^1.2.0", "superagent": "^0.18.2", "codemirror": "3.20.0" }, "repository": { "type": "git", "url": "git+ssh://git@github.com/sahusoftcom/react-utils.git" }, "devDependencies": { "autoprefixer": "^6.6.1", "babel-core": "^6.21.0", "babel-loader": "^6.2.10", "babel-preset-es2015": "^6.18.0", "babel-preset-react": "^6.16.0", "css-loader": "^0.6.12", "extract-text-webpack-plugin": "^1.0.1", "fs": "0.0.1-security", "gulp": "^3.8.8", "gulp-concat": "^2.4.0", "gulp-jshint": "^1.8.4", "gulp-rename": "^1.2.0", "gulp-sass": "^0.7.3", "gulp-uglify": "^1.0.1", "gulp-util": "^3.0.1", "html-webpack-plugin": "^2.26.0", "jshint-loader": "~0.6.0", "jsx-loader": "^0.11.2", "karma": "~0.10.9", "karma-chrome-launcher": "~0.1.2", "karma-firefox-launcher": "~0.1.3", "karma-jasmine": "~0.1.5", "karma-phantomjs-launcher": "~0.1.1", "karma-script-launcher": "~0.1.0", "karma-webpack-plugin": "~1.0.0", "path": "^0.12.7", "postcss-loader": "^1.2.1", "react": "^15.4.2", "react-dom": "^15.4.2", "react-hot-loader": "^0.4.5", "react-router": "^3.0.0", "style-loader": "^0.6.5", "url-loader": "~0.5.4", "webpack": "^1.14.0", "webpack-dev-server": "^1.16.2" }, "bugs": { "url": "https://github.com/sahusoftcom/react-utils/issues" }, "homepage": "https://github.com/sahusoftcom/react-utils#readme", "main": "app.js", "author": "yubai", "license": "ISC" }
以上代码请注意这里，标红部位
2、webpack.config.js文件（webpack主文件）
var webpack = require('webpack'), path = require('path'), fs = require('fs'), HtmlWebpackPlugin = require('html-webpack-plugin'), ExtractTextPlugin = require('extract-text-webpack-plugin'); module.exports = { entry: { app: ["./app.js"] }, output: { //输出目录 path: __dirname + './__build__', publicPath: "", filename: 'shared.js', chunkFilename: '[name].[chunkhash:3].min.js', }, module: { //在配置文件里添加JSON loader loaders: [{ test: /\.js$/, exclude: /^node_modules$/, loader: 'babel' }, { test: /\.css$/, exclude: /^node_modules$/, loader: ExtractTextPlugin.extract('style', ['css', 'autoprefixer']) }, { test: /\.less$/, exclude: /^node_modules$/, loader: ExtractTextPlugin.extract('style', ['css', 'autoprefixer', 'less']) }, { test: /\.scss$/, exclude: /^node_modules$/, loader: ExtractTextPlugin.extract('style', ['css', 'autoprefixer', 'sass']) }, { test: /\.(eot|woff|svg|ttf|woff2|gif|appcache)(\?|$)/, exclude: /^node_modules$/, loader: 'file-loader?name=[name].[ext]' }, { test: /\.(png|jpg|gif)$/, exclude: /^node_modules$/, loader: 'url-loader?limit=8192&name=images/[hash:8].[name].[ext]' //注意后面那个limit的参数，当你图片大小小于这个限制的时候，会自动启用base64编码图 }, { test: /\.jsx$/, exclude: /^node_modules$/, loaders: ['jsx', 'babel'] }] }, resolve: { extensions: ['', '.js', '.json'] }, postcss: [ require('autoprefixer') //调用autoprefixer插件,加入各个浏览器的前缀 ], plugins: [ new HtmlWebpackPlugin({ template: './index.html' }), new ExtractTextPlugin('[name]-[hash:3].css'), //css随机数 new webpack.HotModuleReplacementPlugin(), //热加载插件 new webpack.DefinePlugin({ 'process.env.NODE_ENV': '"development"' }), new webpack.NoErrorsPlugin() ] };
3、webpack服务文件：dev-serve.js