9.10 class

1、声明一个类

// 声明一个类
class Person {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }
    say() {
        console.log(this.name);
    }
}
// 创建实例
let p = new Person('张三', 100);
console.log(p);
p.say();

2、继承类

class Father {
      constructor(x, y) {
           this.x = x;
           this.y = y;
      }
      money() {
            console.log('$100');
      }
      sum() {
            console.log(this.x + this.y);
      }
}
class Son extends Father {
      constructor(x, y) {
            super(x, y); //调用父类的中的构造函数
      }
}
var son = new Son(10, 20);
son.money();
son.sum()