Load external JS only on desktops and not on mobile devices

<script>
(function() {
if( window.innerWidth > 600 ) {
    var theScript = document.createElement('script');
    theScript.type = 'text/javascript';
    theScript.src = '<?php bloginfo('template_url'); ?>/js/process-home.js';
 
    var head = document.getElementsByTagName('head')[0];
    head.appendChild(theScript);
}
})();
</script>

<script>
(function() {
if( window.innerWidth > 600 ) {
    document.write('<scr'+'ipt type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/four.js" ></scr'+'ipt>');
}
})();
</script>