Edit in JSFiddle

// construct
function Human(name){
   this.name = name;
}

// setter
Human.prototype.setName = function(name){
	this.name = name;
};

// getter
Human.prototype.getName = function(){
	return this.name;
};

/* --------------------------- */
var human = new Human("John");
human.setName("Eddie");
alert(human.getName());