错误1：找不到__webpack_hmr
GET http://127.0.0.1/__webpack_hmr 404 (Not Found)
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在webpack的entry配置添加引用路径’webpack-hot-middleware/client?path=/__webpack_hmr&timeout=10000&reload=true’，相关的参数最好不要省略，否则会出现无法自动刷新的问题。处理脚本如下：
// 准备webpack配置信息let hotMiddlewareScript = 'webpack-hot-middleware/client?path=/__webpack_hmr&timeout=10000&reload=true', wpConfig = require('./webpack.config'), // 准备修改配置信息 entries = Object.keys(wpConfig.entry)// 添加热加载信息entries.forEach((key) => { wpConfig.entry[key].push(hotMiddlewareScript);})// 添加插件信息if(wpConfig.plugins === undefined) { wpConfig.plugins = []}// 添加热加载插件wpConfig.plugins.push( new webpack.optimize.OccurrenceOrderPlugin(), new webpack.HotModuleReplacementPlugin(), new webpack.NoEmitOnErrorsPlugin())
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错误2：找不到hot-update.json
main.bundle.js:30 GET http://127.0.0.1/static/44588e3474a86cea5670.hot-update.json 404 (Not Found)
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webpack配置中的publicPath必须是绝对地址，详细配置如下所示：
module.exports = { // 其他配置信息略 // …… output : { path: configs.dist, // 必须是绝对地址 publicPath: 'http://127.0.0.1/static/', filename : '[name].bundle.js', libraryTarget : 'var' }}
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错误3：No ‘Access-Control-Allow-Origin’ header
XMLHttpRequest cannot load http://127.0.0.1/static/df222441abc9ddb6a616.hot-update.json. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.
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不可思议，在本地访问竟然会出现AJAX跨域问题，仔细检查后发现，浏览器把localhost与127.0.0.1当成了两个不同的域，解决的方法很多，只说最简单的一种，访问应用时，尽量采用与webpack配置中的publicPath完全一致的路径，如在本文中，最好的访问方法是输入http://127.0.0.1/访问本地应用。
错误4：OccurenceOrderPlugin构造器错误
new webpack.optimize.OccurenceOrderPlugin(),TypeError: webpack.optimize.OccurenceOrderPlugin is not a constructor at Object.<anonymous> (E:\Workspace\vue-hot\dev-server.js:23:6) at Module._compile (module.js:570:32) at Object.Module._extensions..js (module.js:579:10) at Module.load (module.js:487:32) at tryModuleLoad (module.js:446:12) at Function.Module._load (module.js:438:3) at Module.runMain (module.js:604:10) at run (bootstrap_node.js:394:7) at startup (bootstrap_node.js:149:9) at bootstrap_node.js:509:3
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此问题一般出现在webpack 2中，解决办法很简单，将OccurenceOrderPlugin改为OccurrenceOrderPlugin即可。
总结
webpack编译程序有两种热加载方式，webpack-dev-server与webpack-hot-middleware方式，从webpack 2的性能来看，webpack-dev-server完全能够满足开发的需要，但最大的问题在于，webpack-dev-server不能向外发布服务，只能在本地访问。