javascript requestanimationframe stack overflow

1window.requestAnimFrame = function(){
2    return (
3        window.requestAnimationFrame       || 
4        window.webkitRequestAnimationFrame || 
5        window.mozRequestAnimationFrame    || 
6        window.oRequestAnimationFrame      || 
7        window.msRequestAnimationFrame     || 
8        function(/* function */ callback){
9            window.setTimeout(callback, 1000 / 60);
10        }
11    );
12}();