我的理解，webpack如果什么loader、plugin都不加的話，webpack 不會(huì)更改代碼中除 import 和 export 語(yǔ)句以外的部分，就是es6也需要有babel-loader之類的來(lái)處理。所以你說(shuō)的某段代碼應(yīng)該是說(shuō)loader的處理希望對(duì)某個(gè)模塊的某一部分進(jìn)行排除的話，這個(gè)應(yīng)該需要自己來(lái)寫(xiě)loader才行，一般通用的loader的都是以模塊為最小單元處理，

剛看了下了評(píng)論，題主再問(wèn)使用uglifyjs-webpack-plugin這個(gè)插件的問(wèn)題；可以看看compress-options參數(shù)；

drop_console (default: false) -- Pass true to discard calls to console.* functions. If you wish to drop a specific function call such as console.info and/or retain side effects from function arguments after dropping the function call then use pure_funcs instead.

pure_funcs (default: null) -- You can pass an array of names and UglifyJS will assume that those functions do not produce side effects. DANGER: will not check if the name is redefined in scope. An example case here, for instance var q = Math.floor(a/b). If variable q is not used elsewhere, UglifyJS will drop it, but will still keep the Math.floor(a/b), not knowing what it does. You can pass pure_funcs: [ 'Math.floor' ] to let it know that this function won't produce any side effect, in which case the whole statement would get discarded. The current implementation adds some overhead (compression will be slower).

可以知道，其實(shí)pure_funcs提供了使用者來(lái)保持書(shū)寫(xiě)的代碼不被改動(dòng)的功能，題主可以具體實(shí)驗(yàn)下。