1. //定义一个人的接口
    2. interface Human {
    3.     name: string;
    4.     age: number;
    5.     say(word: string): void;
    6. }
    7. //让老师类实现Human接口，老师类实现接口的时候必须提供接口的具体信息
    8. class Teacher implements Human{
    9.     name = "老师";
    10.     age = 38;
    11.     say(word: string): void {
    12.         console.log("老师说"+word)
    13.     }
    14. }
    15. //让学生类实现Human接口，学生类实现接口的时候必须提供接口的具体信息
    16. class Student implements Human{
    17.     name = "学生";
    18.     age = 18;
    19.     say(word: string): void {
    20.          console.log("学生说"+word)
    21.     }
    22. }