class Person{
constructor(name,age){
this.name = name;
this.age = age;
}
say(something){
console.info("I'm "+this.name+", "+this.age+" years old.");
console.info(something);
}
}
class SuperMan extends Person{
constructor(name,age,power){
super(name,age);
this.power = power;
}
fly(height){
this.say("Hello, human beings!");
console.info("I can fly to "+height+".");
}
}
const zs = new Person("Zhang San",20);
zs.say("Hello");
const spider = new SuperMan("Spider Man",10,"save the earth");
spider.fly(100000);
console