When webpack-dev-server is running it will watch your files for changes. When that happens it rebundles your project and notifies browsers listening to refresh. To trigger this behavior you need to change your index.html file in the build/ folder.
当运行 webpack-dev-server 的时候，它会监听你的文件修改。当项目重新合并之后，会通知浏览器刷新。为了能够触发这样的行为，你需要把你的 index.html 放到 build/ 文件夹下，然后做这样的修改：
build/index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
</head>
<body>
<script src="bundle.js"></script>
</body>
</html>
We added a script that refreshes the application when a change occurs. You will also need to add an entry point to your configuration:
我们需要增加一个脚本当发生改动的时候去自动刷新应用，你需要在配置中增加一个入口点。
webpack.config.js
var path = require('path');
module.exports = {
entry: [
'webpack/hot/dev-server',
'webpack-dev-server/client?http://localhost:8080',
path.resolve(__dirname, 'app/main.js')
],
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js',
},
};
Thats it! Now your application will automatically refresh on file changes.
就是这样！现在你的应用就可以在文件修改之后自动刷新了。
默认环境
In the example above we created our own index.html file to give more freedom and control. It is also possible to run the application from http://localhost:8080/webpack-dev-server/bundle. This will fire up a default index.html file that you do not control. It also fires this file up in an iFrame allowing for a status bar to indicate the status of the rebundling process.
在上面的例子中我们创建了 index.html 文件来获取更多的自由和控制。同样也可以从 http://localhost:8080/webpack-dev-server/bundle 运行应用。这会触发一个默认的你不能控制的 index.html ，它同样会触发一个允许iFrame中显示重合并的过程。
I discuss an alternative,
inlinebased approach at the Developing with Webpack chapter of SurviveJS - Webpack and React.我探讨了一个可供代替的方法，
inline是基于 Developing with Webpack 中 SurviveJS - Webpack and React 章节的方案。