core_js_21.js

var Parent = function() {
     this.print= function() {
          alert("My name is " + this.getName());
     };
};

var Children = function(name) {
     this.name = name;

     this.getName = function() {
          return this.name;
     };
};

Children.prototype = new Parent;

var children = new Children('Moon-Hak-I');
children.print();