[1] configuration ( 著, 版) <https://webpack.github.io/docs/configuration.html>
[absolute-resource-path] is replaced with the absolute filename.
Default (devtool=[inline-]source-map): "webpack:///[resource-path]"
Default (devtool=eval): "webpack:///[resource-path]?[loaders]"
Default (devtool=eval-source-map): "webpack:///[resource-path]?[hash]"