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Why use prototype in this example

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Here I have two examples. The difference between these is that in example 1 
I create sayHello as a prototype while in
exemple 2 I add sayHello as a function in the class Person

I mean in both example 1 and 2 I create an instance of Person.
I can't see any point to use a prototype compared to add methods to the 
class?

Start example 1 med prototype
***********************
var Person = function (firstName) {
  this.firstName = firstName;
};

Person.prototype.sayHello = function() {
  console.log("Hello, I'm " + this.firstName);
};

var person1 = new Person("Alice");
var person2 = new Person("Bob");

// call the Person sayHello method.
person1.sayHello(); // logs "Hello, I'm Alice"
person2.sayHello(); // logs "Hello, I'm Bob"
End example 1
************

Start example 2 utan prototype
***********************
       var Person = function (firstName) {
           this.firstName = firstName;

           this.sayHello = function () {
               alert("Hello, I'm " + this.firstName);
           };
       };

       var person1 = new Person("Alice");
       var person2 = new Person("Bob");

       // call the Person sayHello method.
       person1.sayHello(); // logs "Hello, I'm Alice"
       person2.sayHello(); // logs "Hello, I'm Bob"

//Tony 

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Why use prototype in this example "Tony Johansson" <johansson.andersson@telia.com> - 2015-01-06 23:29 +0100
  Re: Why use prototype in this example "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-01-06 23:53 +0100
  Re: Why use prototype in this example Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-01-07 04:25 +0100

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