枚举

枚举是 TypeScript 添加到 JavaScript 的一项功能，它允许描述一个值，该值可能是一组可能的命名常量之一。与大多数 TypeScript 功能不同，这不是对 JavaScript 的类型级添加，而是添加到语言和运行时的东西。正因为如此，这是一个你应该知道存在的功能，但除非你确定，否则可能会推迟使用。您可以在 枚举参考页 中阅读有关枚举的更多信息。

Enums are a feature added to JavaScript by TypeScript which allows for describing a value which could be one of a set of possible named constants. Unlike most TypeScript features, this is not a type-level addition to JavaScript but something added to the language and runtime. Because of this, it's a feature which you should know exists, but maybe hold off on using unless you are sure. You can read more about enums in the Enum reference page.