spy js view js variable value

i try spy js on a real website  that use nav menu that stic kt othe top when scrool . 

The jquery code  is paste below 

function processScroll() {
   var scrollTop = $win.scrollTop(), M = 10;
   if(scrollTop >= navTop && !isFixed) {
      isFixed = 1;
      $nav.addClass('navbar-fixed-top');
      $sep.addClass('fixed-margin');
   } else if(scrollTop <= navTop - M && isFixed) {
      isFixed = 0;
      $nav.removeClass('navbar-fixed-top');
      $sep.removeClass('fixed-margin');
   }
}

How can i spy scrolTop &  navTop variable value in spy.js launch inside phpstorm ? 

Regard's