Abstraction (抽象化)

class ImplementAbstraction {
  // method to set values of internal members
  set(x, y) {
    this.a = x;
    this.b = y;
  }
  display() {
    console.log("a = " + this.a);
    console.log("b = " + this.b);
  }
}
const obj = new ImplementAbstraction();
obj.set(10, 20);
obj.display();
// a = 10
// b = 20