Exclude JavaScript from functioning at certain screen size

Question

I would like to exclude this JavaScript from functioning at a screen size smaller than 768px.

Do you know what I need to add to the code?

<script type="text/javascript">
    var timeOut;
    function scrollToTop() {
        if (document.body.scrollTop!=0 || document.documentElement.scrollTop!=0){
            window.scrollBy(0,-50);
            timeOut=setTimeout('scrollToTop()',10);
        }
        else{ 
            clearTimeout(timeOut);
        }
    }
</script>

Answer 1

Add this to your method and you are good to go.

if(screen.width > 768) {
   //your method logic
}