1.在index.html中引入ico文件

    <link rel="icon" href="./favicon.ico" type="image/x-icon">

2.在build/webpack.prod.conf.js中，粘如如下代码。

    new HtmlWebpackPlugin({
      filename: config.build.index,
      template: 'index.html',
      inject: true,
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
      },
      chunksSortMode: 'dependency'
    }),

轻松搞定！