Javascript inheritance

JS.inheritance.js

var Person = function () {
  this.fname = 'douglas';
  this.lname = 'crockford';
};

var Student = function() {
  return this;
};

Student.prototype = new Person();

var student1 = new Student();

console.log(student1 instanceof Student); // true
console.log(student1 instanceof Person); // true

console.log(typeof student1.sayMyName); // undefined

Person.prototype.sayMyName = function() {
  return this.fname + " " + this.lname;
}

console.log(typeof student1.sayMyName); // function

student1.sayMyName(); // "douglas crockford"