メモ：rafでdelay処理

function delay(cb, delayTime, everyTimeCb){
  var cancel = false;
  delayTime = delayTime || 0;
  (function(){
    var baseTime;
    var raf = window.requestAnimationFrame;
    raf(function(now){
      baseTime = baseTime || now;
      var elapsedTime = now - baseTime;
      if(elapsedTime >= delayTime){
        cb(now);
      }
      else{
        everyTimeCb( elapsedTime );
        cancel || raf(arguments.callee);
      }
    });
  })();
  return function(){
    cancel = true;
  };
};

使い方

// 5秒後に実行
var cancel = delay(function(){ ... }, 5000);

// 中止
cancel();

// 経過時間をみる
delay(function(){ ... }, 5000, function(elapsedTime){
  console.log(elapsedTime + 'ms経過');
});