子类型与赋值

到目前为止，我们使用的是 "compatible"，这不是语言规范中定义的术语。在 TypeScript 中，有两种兼容性：子类型和赋值。这些不同之处仅在于分配扩展了与规则的子类型兼容性，以允许分配到 any 和从 any 分配，以及从 enum 分配相应的数值。

So far, we've used "compatible", which is not a term defined in the language spec. In TypeScript, there are two kinds of compatibility: subtype and assignment. These differ only in that assignment extends subtype compatibility with rules to allow assignment to and from any, and to and from enum with corresponding numeric values.

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