CODE EXAMPLE FOR JAVASCRIPT

javascript function page size

 //function for screen resize
 function screen_resize() {
        var h = parseInt(window.innerHeight);
        var w = parseInt(window.innerWidth);

        if(w <= 500) {
            //max-width 500px
            // actions here...
            red();
        } else if(w > 500 && w <=850) {
            //max-width 850px
            // actions here...
            orange();
        } else {
            // 850px and beyond
            // actions here...
            green();
        }

    }