requestAnimationFrame.js

requestId: 0,

move: function() {
  var _this = this;

  if (this.requestId === 0) {
    (function animationLoop() {
      _this.render();
      _this.requestId = requestAnimationFrame(animationLoop, _this.move);
    })();
  }
},

render: function() {
  // Add some drawing
},

onKeyUp: function() {
  // Cancel the animation request
  if (this.requestId) {
    cancelAnimationFrame(this.requestId);
  }
  // Allow a new request to be called
  this.requestId = 0;
}