修改配置： 

    output: {
      filename: `js/[name].[hash:8].js`,
      chunkFilename: `js/[name].[hash:8].js`
    },
    optimization: {
      splitChunks: {
        maxSize: 250000,
        automaticNameDelimiter: '-'
      }
    }

修改后：

可以看见~ 换成了 -