How can I tell javascript to execute after max-width

I want to execute below JavaScript only if width is set to 600px or above. How can I put max-width condition?

$(function() {

   $('#nav li a').bind('click',function(event){
       var $anchor = $(this);

            $('html, body').stop().animate({
                scrollTop: $($anchor.attr('href')).offset().top
            }, 1500,'easeInOutExpo');               

                event.preventDefault();
        });
});

Answers

If the viewport width, you'd do something like this inside the click callback.

if ($(window).width() < 600) {
    return;
}

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