Пример простого Router

router.js

define(function(){
   
    var routes = [
                  {hash:'#list', controller:'ListController'},
                  {hash:'#add',  controller:'AddController'}
    ];
    var defaultRoute = '#list';
    var currentHash = '';
   
    function startRouting(){
        window.location.hash = window.location.hash || defaultRoute;
        setInterval(hashCheck, 100);
    }
   
    function hashCheck(){
        if (window.location.hash != currentHash){
            for (var i = 0, currentRoute; currentRoute = routes[i++];){
                if (window.location.hash == currentRoute.hash)
                    loadController(currentRoute.controller);
            }
            currentHash = window.location.hash;
        }
    }
   
    function loadController(controllerName){
        require(['Controllers/' + controllerName], function(controller){
            controller.start();
        });
    }
   
    return {
        startRouting:startRouting
    };
});

index.js

require(['Models/User', 'Router'], function(User, Router){
   
    var users = [
                 new User('Barney'),
                 new User('Cartman'),
                 new User('Sheldon')
    ];
   
    localStorage.users = JSON.stringify(users);

    Router.startRouting();
});