Disable script at certain screen resolution?

Question

JavaScript

I messed up the up arrow on the site, you need to make sure that when the media value (max-width: 320px) is set, the script is disabled

<script type="text/javascript">
 
$(function() {
 
$(window).scroll(function() {
 
if($(this).scrollTop() != 0) {
 
$('#toTop').fadeIn();
 
} else {
 
$('#toTop').fadeOut();
 
}
 
});
 
$('#toTop').click(function() {
 
$('body,html').animate({scrollTop:0},800);
 
});
 
});

</script>

Answer 1

if(window.innerWidth > 320){

$(window).scroll(function() {
 
if($(this).scrollTop() != 0) {
 
$('#toTop').fadeIn();
 
} else {
 
$('#toTop').fadeOut();
 
}
 
});
 
$('#toTop').click(function() {
 
$('body,html').animate({scrollTop:0},800);
 
});

}

Answer 2

without JS - no way.