在JavaScript中模拟类(class)及类的继承关系(3)

//定义类 class Point { constructor(x, y) { this.x = x; this.y = y; } toString() { return '('+this.x+', '+this.y+')'; } } var point = new Point(2, 3); point.toString() // (2, 3) point.hasOwnProperty('x') // true point.hasOwnProperty('y') // true point.hasOwnProperty('toString') // false point.__proto__.hasOwnProperty('toString') // true

Class的继承

class ColorPoint extends Point { constructor(x, y, color) { super(x, y); // 调用父类的constructor(x, y) this.color = color; } toString() { return this.color + ' ' + super.toString(); // 调用父类的toString() } }

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