SOURCE

class Vehicle{
 constructor(name){
 this.name=name;
 }
  showName(){
  console.log("我的名字是:"+this.name);
  }
}

class Car extends Vehicle{
  constructor(name,color){
    super(name)
    this.color=color;
  }
  showColor(){
      console.log("我的颜色是:"+this.color);
  }
}

var v=new Vehicle('卡车');

var c=new Car('奔驰','黑色');

v.showName();

c.showName();

c.showColor();