Classic Inheritance JS

ClassicInheritance.js

Function.prototype.extends=function(base){
	var t = function () {}
	t.prototype = base.prototype;
	this.prototype = new t();
	this.prototype.constructor = this;
};

var Animal = function(){
	this.isAlive = true;
}

Animal.prototype.die = function(){
	this.isAlive = false;
}

var Dog = function(){
	// Call the base constructor
	Animal.apply(this, arguments);
}
Dog.extends(Animal);

/*****
* var dog = new Dog();
* alert(dog.isAlive);
* dog.die();
* alert(dog.isAlive);
*/