接口类型

对象接口

  1. interface IUser {
  2.   name: string;
  3.   age: number;
  4.   sex: "男" | "女";
  5. }
  7. let user: IUser;
  8. user = {
  9.   name: "zhangsan",
  10.   age: 14,
  11.   sex: "男",
  12. };

数组接口

  1. interface IArr {
  2.   // 下标类型为 number，值类型为 number | string
  3.   [ids: number]: number | string;
  4. }
  6. let ids: IArr = [1, 2, "3", "4"];

函数接口

  1. interface IFun {
  2.   (str: string, num: number): void;
  3. }
  5. let fn: IFun = (name: string, age: number) => {
  6.   console.log(name + "今年" + age + "岁");
  7. };
  9. fn("张三", 18);

继承