• 两个或两个以上类型成员组成，中间用管道符 | 隔开

    属性签名

    ```typescript interface Foo { a: number, b: number }

interface Bar { b: number, c: number }

type Baz = Foo | Bar;

  1. <a name="llvan"></a>
  2. # 索引签名
  3. ```typescript
  4. interface Foo {
  5.   [prop: string]: number
  6. }
  7. interface Baz {
  8.   [prop: string]: string
  9. }
  11. type T = Foo | Baz
  12. // 等价于
  13. interface Bar {
  14.   [prop: string]: number | string
  15. }

调用签名与构造签名

  1. interface Foo {
  2.   (name: string): string
  3. }
  5. interface Baz {
  6.   (name: string): number
  7. }
  9. type T = Foo | Baz
  11. // 等同于
  13. interface Bar {
  14.   (name: string): number | string
  15. }
  2. interface Foo {
  3.   new (name: string): string
  4. }
  6. interface Baz {
  7.   new (name: string): number
  8. }
  10. type T = Foo | Baz
  13. interface Bar {
  14.   new (name: string): number | string
  15. }