javascript - How to define a "type" in AMD/RequireJS style -

i'm working on durandal spa, , i've setup views , viewmodels. i'm unclear how should creating "model" objects on client side. instance, let's want define , create "person" model object.

everything else in app defined amd style. allows durandal/requirejs automatically load files needs.

so, first thought might define "person" model type in models/person.js file, this:

define(function () {     var id = ko.observable(0);     var firstname = ko.observable('');     var lastname = ko.observable('');      return = {         id: id,         firstname: firstname,         lastname: lastname,     }; }); 

however, don't think right, because here don't think there's way create individual "person" objects. instance, let's wanted create 2 "person" objects. durandal/requirejs happily load in "person" module, it's 1 object--and may want create instance of "person" type, or 5 more instances, etc.

what's appropriate way this? helping clear confusion!

update: i've gotten responses explain ways this. think confusion stemmed fact "module" not "type", or "class". it's more singleton object. if want define type, , put inside module, need create module is, essentially, factory.

is right?

a factory makes sense in case. but, have clarifying question: factory accepted method defining model types in durandal/requirejs/amd style javascript app? i'm sure i'm not first person run issue. i'm wondering how has been solved before, , (especially) if there accepted convention in amd world on how define reusable types.

define(function () {      return function(){        var self = this;        self.id = ko.observable(0);        self.firstname = ko.observable('');        self.lastname = ko.observable('');     }; });  define(['models/person'], function(person){     var myperson = new person(); });