How to disable Jquery function when window width smaller than X -


i'm newbie, , couldn't work. i'm not sure i'm doing wrong. checked other answers issue on stack overflow, still couldn't manage disable resizing on scroll function, depending on screen width.

i want function stop working when screen width smaller 900 px.

any appreciated 

<script>     $(function(){     $('.nav').data('size','big');     });      $(window).scroll(function(){     var $nav = $('.nav');     if ($('body').scrolltop() > 0) {         if ($nav.data('size') == 'big') {             $nav.data('size','small').stop().animate({                 height:'40px'             }, 600);             $('.nav-collapse li a').css('height','40px');         }     } else {         if ($nav.data('size') == 'small') {             $nav.data('size','big').stop().animate({                 height:'80px'             }, 600);             $('.nav-collapse li a').css('height','80px');         }           }     });      </script> 

<script>     var limiter = 900;      $(function(){         $('.nav').data('size','big');     });      $(window).scroll(function(){          if ( $(window).width() > limiter ) { // here go              var $nav = $('.nav');             if ($('body').scrolltop() > 0) {                 if ($nav.data('size') == 'big') {                     $nav.data('size','small').stop().animate({                         height:'40px'                     }, 600);                     $('.nav-collapse li a').css('height','40px');                 }             } else {                 if ($nav.data('size') == 'small') {                     $nav.data('size','big').stop().animate({                         height:'80px'                     }, 600);                     $('.nav-collapse li a').css('height','80px');                 }               }         }     });      </script>

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