Es6-class记录

[Gtanxingwen]

class Point {
        constructor(x, y) {
            this.x = x;
            this.y = y;
        }
        add() {
            return this.x + this.y;
        }
    }

const b = new Point(1, 3);
console.log(b)
console.log(b.__proto__)
console.log(b.constructor)
console.log(Point.prototype)
console.log(Point.prototype.constructor)
console.log('实例对象的原型指向类的prototype属性');
console.log('b.__proto__ === Point.prototype');
console.log(b.__proto__ === Point.prototype);
console.log('类的原型属性prototype属性的构造函数指向类本身===类本身就指向构造函数');
console.log('Point.prototype.constructor === Point');
console.log(Point.prototype.constructor === Point);
console.log('实例对象的构造函数指向类');
console.log('b.constructor === Point');
console.log(b.constructor === Point);
console.log('实例对象的constructor方法指向类原型的构造方法');
console.log('b.constructor === Point.prototype.constructor');
console.log(b.constructor === Point.prototype.constructor)