......
module.exports = {
  ......
  build: {
    ......
    /**
     * Source Maps
     */
    productionSourceMap: false, // 改为 false
    // https://webpack.js.org/configuration/devtool/#production
    devtool: '#source-map',
    ......
  }
}
cnpm run build之后的.js、.css文件,打包成.js.gz、.css.gz文件
安装webpack插件 compression-webpack-plugin
修改 config/index.js
productionGzip: true, // 改为 true
productionGzipExtensions: ['js', 'css'],
if (config.build.productionGzip) {
  const CompressionWebpackPlugin = require('compression-webpack-plugin')
  webpackConfig.plugins.push(
    new CompressionWebpackPlugin({
      // asset: '[path].gz[query]',
      filename: '[path].gz[query]',
      algorithm: 'gzip',
      test: new RegExp(
        '\\.(' +
        config.build.productionGzipExtensions.join('|') +
        ')$'
      ),
      threshold: 10240,
      minRatio: 0.8
    })
  )
}