请教-js 函数构造器语法

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new Function ([arg1[, arg2[, ...argN]],] functionBody)

形如以上代码在 MDN 上看到过几次了，各参数间都以中括号层层包裹，还有英文逗号，看起来好陌生，不知是什么语法。求各位大佬指点迷津🙏

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