类型兼容性

TypeScript 中的类型兼容性基于结构子类型。结构类型是一种仅基于其成员关联类型的方法。这与名义类型相反。考虑以下代码：

Type compatibility in TypeScript is based on structural subtyping. Structural typing is a way of relating types based solely on their members. This is in contrast with nominal typing. Consider the following code:

interface Pet {
  name: string;
}

class Dog {
  name: string;
}

let pet: Pet;
// OK, because of structural typing
pet = new Dog();

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