16、类

class People{
    constructor(name,age,sex){
    this.name=name;
    this.age=age;
    this.sex=sex;
    }
    sayHello(){
        console.log("你们好"+"我的名字是"+this.name+"年龄"+this.age+"性别"+this.sex)
    }
}
class Student extends People{
    constructor(name,age,sex,shengao){
        super(name,age,sex);
        this.shengao=shengao;
    }
    sayHello(){
        console.log("你们好"+"我的名字是"+this.name+"年龄"+this.age+"性别"+this.sex+"身高"+this.shengao)
    }
    girlfriend(){
        console.log("她的身高"+this.shengao);
    }

}
var people=new People("小红",18,"女");
people.sayHello();
var xiaoming=new Student("小红",18,"女","179");
xiaoming.sayHello();
xiaoming.boyfriend();