Mega Code Archive

 

Categories / JavaScript Tutorial / Object Oriented

 

Using instanceof operator to check the subclass created by Prototype Chaining

function SubClass() { } SubClass.prototype = new BaseClass(); SubClass.prototype.name = ""; SubClass.prototype.sayName = function () {     alert(this.name); }; var objA = new BaseClass(); var objB = new SubClass(); var objB = new SubClass(); alert(objB instanceof BaseClass);    //outputs "true"; alert(objB instanceof SubClass);    //outputs "true"