JavaScript ES6中的继承

 <script>

        /*
        // ES6之前的继承
        function Person(myName, myAge) {
            this.name = myName;
            this.age = myAge;
            this.say = function () {
                console.log(this.name, this.age);
            };
        }

        function Studnt(myName, myAge, myScore) {
            // 通过call函数借用父类的构造函数
            Person.call(this, myName, myAge);
            this.score = myScore;
            this.learn = function () {
                console.log("day day up");
            };
        }
        // 将子类的原型对象更改为父类的实例对象
        Studnt.prototype = new Person();
        Studnt.prototype.constructor = Studnt;
        let stu = new Studnt("peter", 20, 50);
        stu.say();
        console.log(stu);
        */


        // ES6中的继承
        class Person{
            constructor(myName, myAge){
                this.name = myName;
                this.age = myAge;
            }

            say(){
                console.log(this.name, this.age);
            }
        }

        class Student extends Person{
            constructor(myName, myAge, myScore){
                super(myName, myAge);
                this.score = myScore;
            }
            learn = function(){
                console.log("day day up");
            }
        }

        let stu = new Student("tm", 12, 100);
        console.log(stu);
        stu.say();
    </script>