requestanimation () 호환 처리

window.requestNextAnimationFrame = (function () { var originalWebkitRequestAnimationFrame = undefined, wrapper = undefined, callback = undefined, geckoVersion = 0, userAgent = navigator.userAgent, index = 0, self = this;
//Workaround for Chrome 10 bug where Chrome//does not pass the time to the animation function
if (window.webkitRequestAnimationFrame) {//Define the wrapper

wrapper = function (time) {
  if (time === undefined) {
    time = +new Date();
  }
  self.callback(time);
};

// Make the switch

originalWebkitRequestAnimationFrame = window.webkitRequestAnimationFrame;

window.webkitRequestAnimationFrame = function (callback, element) {
  self.callback = callback;

  // Browser calls the wrapper and wrapper calls the callback

  originalWebkitRequestAnimationFrame(wrapper, element);
}

}
//Workaround for Gecko 2.0, which has a bug in//mozRequestAnimationFrame() that restricts animations//to 30-40 fps.
if (window.mozRequestAnimationFrame) {//Check the Gecko version. Gecko is used by browsers//other than Firefox. Gecko 2.0 corresponds to//Firefox 4.0.

index = userAgent.indexOf('rv:');

if (userAgent.indexOf('Gecko') != -1) {
  geckoVersion = userAgent.substr(index + 3, 3);

  if (geckoVersion === '2.0') {
    // Forces the return statement to fall through
    // to the setTimeout() function.

    window.mozRequestAnimationFrame = undefined;
  }
}

}
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||

  function (callback, element) {
    var start,
        finish;

    window.setTimeout(function () {
      start = +new Date();
      callback(start);
      finish = +new Date();

      self.timeout = 1000 / 60 - (finish - start);

    }, self.timeout);
  };

}());
window.cancelNextRequestAnimationFrame = window.cancelRequestAnimationFrame || window.webkitCancelAnimationFrame || window.webkitCancelRequestAnimationFrame || window.mozCancelRequestAnimationFrame || window.oCancelRequestAnimationFrame || window.msCancelRequestAnimationFrame || clearTimeout;