1、继承 extends

  1. // 1、定义一个Person类，包含name，age两个属性
  2. class Person1 {
  3.     name:string
  4.     age:number
  5.     constructor(name:string,age:number){
  6.         this.name = name
  7.         this.age = age
  8.     }
  9.     sayName():void{
  10.         console.log(this.name);
  11.     }
  12. }
  13. // 2、student skill， saySkill
  14. /* class Student1{
  15.     name:string
  16.     age:number
  17.     skill:string
  18.     constructor(name:string,age:number,skill:string){
  19.         this.name = name 
  20.         this.age = age
  21.         this.skill = skill
  22.     }
  23.     saySkill():void{
  24.         console.log(this.skill);
  25.     }
  26. } */
  28. // extends子类会继承父类的属性和方法
  29. class Student1 extends Person1{
  30.     skill:string
  31.     constructor(name:string,age:number,skill:string) {
  32.         // super指父类（引用父类），只能放在子类构造方法中的第一行
  33.         super(name,age)
  34.         this.skill = skill
  35.     }
  36.     saySkill():void{
  37.         console.log(this.skill);
  38.     }
  39. }
  40. var student:Student1 = new Student1("lisi",18,"vue")
  41. console.log(student);
  42. student.sayName()