答案参考：https://github.com/lykqnbz/BG-Learning-Journal/blob/main/code/typescript/type-challenges/medium/645.Diff.ts 教程和书籍参考： https://juejin.cn/book/7047524421182947366/section/7048282176701333508?utm_source=post_pay_page https://juejin.cn/post/7132490947320872974?searchId=202308100953199500E1704692AECA7B72#heading-30