Using instanceof operator to check the subclass created by Prototype Chaining
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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"
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