gistfile1.txt

// this works
    Router = new Backbone.Router({    
        routes: {
            '':                                             'accounts',
            'accounts/:account_id':                         'accounts',
            'accounts/:account_id/campaigns':               'accounts',
            'accounts/:account_id/campaigns/:campaign_id':  'accounts'
        },
        accounts: function() { 
            console.log('accounts', arguments);
        }
    });
// but the docs say it should be:
    Router = new Backbone.Router.extend({
      ...