ES5  构造函数

      function Person(){
            this.name='建林';
            this.age=18;
            this.say=function(){
                console.log('person的say')
            }
        }
        let p1=new Person();
        console.log(p1.name);
        p1.say();

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ES6 构造函数与继承

        //ES6语法 class
        class Person {
            constructor() {
                this.name = "建林";
                this.age = 18;
            }
            say() {
                console.log('person的say')
            }
        }
        let p2 = new Person();
        console.log(p2.name);
        p2.say();

        //ES6构造函数继承
        class  Child extends Person{
            //复杂写法
            // constructor(){
            //     //继承必须加super()
            //     super();
            //     this.sex="男";
            //     this.name="思聪";//继承覆盖了
            //     this.score=1000;
            // }

            //简单写法
            sex='男';
            name='思聪';
            score=1000;
            
            hello(){
                console.log('hello');
            }
            abc(){
                console.log(abc);
            }
        }
        let p3=new Child();
        console.log(p3);
        console.log(p3.name);
        console.log(p3.say());
        console.log(p3.hello());

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