function Point(x, y) {
  this.x = x;
  this.y = y;
  this.arr = [x, y];
}
Point.prototype.print = function () {
  console.log(`Point:(${this.x},${this.y})`);
};

function ColorPoint(x, y, color) {
  Point.call(this, x, y);
  this.color = color;
}
ColorPoint.prototype.printColor = function () {
  console.log(`ColorPoint:(${this.x},${this.y}) ${this.color} [${this.arr}]`);
};

const cp = new ColorPoint(1, 2, "red");
// cp.print(); // 没有继承prit方法，报错
cp.printColor(); // ColorPoint:(1,2) red [1,2]

console.log(cp instanceof Point); // false
console.log(cp instanceof ColorPoint); // ture