【已解决】WARNING in configuration The ‘mode‘ optionhasnotbeenset,webpack.....

在学习webpack 老是出现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.
You can also set it to ‘none’ to disable any default behavior. Learn more: https://webpack.js.org/configurat
ion/mode/警告

在图示位置添加mode:‘development’,