教程示例代码： [TypeScript 元组内置方法 concat](https://github.com/datawhalechina/wow-fullstack/blob/2ee7ea0a8349acfa816bc8f355f3b4edfa78a597/tutorial/TypeScript/%E7%AC%AC3%E7%AB%A0-ts%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B/Typescript%E6%95%99%E7%A8%8B3.5-%E5%85%83%E7%BB%84.md?plain=1#L24)  [https://www.typescriptlang.org/zh/play](https://www.typescriptlang.org/zh/play/?#code/DYUwLgBGCuAOoEYBcEDaBnMAnAlgOwHMAaCPaAWwCMQsBdCAXjQCIAJEYYAe2ZIBYATLQDcAKFCQY8EAJSpKXLqACGeek1TZoIEePAQsIdNGCQmUxADoAxlzzXlYABQWZASjG286JSEvcCJ0NjUw8IAHpwiEBk+MAvxRZ2Th5+ARItHSA)
