Inheritance Using JavaScript classes

I am just trying to explain inheritance using Javascript Object .

Step 1:

//Below is Normal animal class delaration which takes name and stuff as
params
function Animal(name,stuff){

this.name=name;
this.stuff=stuff;

}

Step 2:

//Adding Methods to the Animal Class using prototype

Animal.prototype.eat=function(){

alert(" Animal Eats :---->"+this.stuff);
}

Step 3:

//Instantiating Animal Object
var a=new Animal("Horse","Grass");
a.eat();

Output :

(Embedded image moved to file: pic04886.jpg)

Step 4:

//Inheriting properties of Animal to Cat

Cat.prototype=new Animal();

//pointing constructor to your Cat Constructor otherwise it goes to Animal
Constructor

Cat.prototype.constructor=Cat;

function Cat(name,stuff,size)
{
this.name=name;
this.stuff=stuff;
this.size=size;
}

//Overriding Animal Eat method in Cat class

Cat.prototype.eat=function(){

Animal.prototype.eat.call(this); //calling super class eat method as well
alert("Cat Eats:---->"+this.name+":"+this.stuff+":"+this.size);
}

var cc=new Cat("Billi","Mmeat","3");

cc.eat();

Output:

(Embedded image moved to file: pic18875.jpg)

(Embedded image moved to file: pic28433.jpg)

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