ohmygod.js

var GrandParent = $Class({ 
   value: '할아버지' 
}); 

var Parent = $Class({ 
  value: '아버지', 
  getGrandFather: function(){ 
  LOG(this.$super.value); 
} 
}).extend(GrandParent); 

var Child = $Class({ 
}).extend(Parent); 

var GrandChild = $Class({ 
}).extend(Child); 

var oParent = new Parent(); 
oParent.getGrandFather(); 

var oChild = new Child(); 
oChild.getGrandFather(); 

var oGrandChild = new GrandChild(); 
oGrandChild.getGrandFather();