router.js

var routeModule = function (module) {
    var routes = {};
    routes[module + '/*url'] = 'handleUrl';
    routes[module] = 'handleUrl';

    var ModuleRouter = Backbone.Router.extend({
        routes: routes,
        handleUrl: function (url) {
            require(['modules/' + module + '/' + module], function (myModule) {
                url = url || '';
                if (url[url.length - 1] === '/') {
                    url = url.substr(0, url.length - 1);
                }
                var sUrl = url.split('/'),
                    ctrl = sUrl.splice(0, 1)[0];

                if (myModule) {
                    if (myModule.hasOwnProperty(ctrl) && typeof myModule[ctrl] === 'function' && ctrl.indexOf('_') !== 0) {
                        // controller inside the module exists
                        console.log(module + '.' + ctrl + '(' + sUrl.toString() + ')');
                        myModule[ctrl].apply(null, sUrl);
                    } else if (myModule.defaultAction) {
                        // module exists, defaul action is called
                        console.log(module + '.defaultAction(' + sUrl.toString() + ')');
                        myModule.defaultAction.apply(null, ((sUrl && ctrl) ? sUrl.concat(ctrl) : []));
                    } else {
                        console.log('404 in ' + module);
                    }
                } else {
                    console.log('404 no ' + module);
                }
            });
        }
    });
    return new ModuleRouter();
};