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Mar 4, 2019
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Update type-of-object-interfaces.md #39

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2 changes: 1 addition & 1 deletion basics/type-of-object-interfaces.md
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Expand Up @@ -128,7 +128,7 @@ let tom: Person = {

使用 `[propName: string]` 定义了任意属性取 `string` 类型的值。

需要注意的是，**一旦定义了任意属性，那么确定属性和可选属性都必须是它的子属性**：
需要注意的是，**一旦定义了任意属性，那么确定属性和可选属性的类型都必须是它的类型的子集**：

```ts
interface Person {
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