WebPack 打包时出错。

WARNING in configuration
The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.

 

原因：没有指定哪种模式

解决：执行命令：webpack --mode=production 或者 webpack --mode=development