Prendi questo codice: 
requestAnimationFrame(function (timestamp) {
  console.log('one', timestamp);
});
requestAnimationFrame(function (timestamp) {
  console.log('two', timestamp);
});
// logs:
// "one", 184.6999999834225
// "two", 184.6999...                            
                                                        
                                posta
                                 22.07.2015 - 12:40