Inheritance method of simplified constructor (II) - class inheritance in ES6

stay ES6 in , The method of inheritance is more convenient , I don't say much nonsense , Go straight to the code

//  Parent class 
class Parent {
    
     //  Construct the properties of the parent class 
     constructor(name, age){
    
       this.name = name;
       this.age = age;
     }
     //  Create the method of the parent class 
     say() {
    
       alert(' My name is ' + this.name + ', I this year ' + this.age);
     }

  }
  //  Subclass 
  class Son extends Parent {
     
     //  Inherits the properties and methods of the parent class 
     constructor(name, age, sex){
    
        //  call super Method to access the constructor on the parent object 
        super(name, age);
        //  New properties 
        this.sex = sex;
     }
     //  The new method 
     say2(){
    
        alert(' I'm Chinese ！');
     }
  }
  //  Instantiate a son1 object 
  let son1 = new Son(' Zhang San ', 18, ' male ')
  son1.say()
  son1.say2()