jQuery - Responsive return function triggering on document ready and window resize.

ready-resize-func.js

var windowW = $(window).width(),
    windowH = $(window).height();

var resizeThread = 0;
function responsiveReturn() {
	clearTimeout(resizeThread);

	windowW = $(window).width();
	windowH = $(window).height();

	$('.window-size').css({'width': windowW +'px','height': windowH +'px'});
  
}
responsiveReturn();

$(window).resize(function() {
	clearTimeout(resizeThread);
	resizeThread = setTimeout(responsiveReturn,500);
});