webpack启动后自动打开浏览器插件：open-browser-webpack-plugin

在webpack.config文件中添加

var OpenBrowserPlugin = require('open-browser-webpack-plugin');

  plugins: [
        new OpenBrowserPlugin({ url: 'http://localhost:8080' })
    ]

则在webpack 启动成功后会打开浏览器

参考文档 https://www.npmjs/package/open-browser-webpack-plugin