ES5 建構函式

      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();

ES6 建構函式與繼承

        //ES6語法 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建構函式繼承
        class  Child extends Person{
            //複雜寫法
            // constructor(){
            //     //繼承必須加super()
            //     super();
            //     this.sex="男";
            //     this.name="思聰";//繼承覆蓋了
            //     this.score=1000;
            // }

            //簡單寫法
            sex='男';
            name
 
='思聰';
            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());