width

    <script>
    
        function resize_get()
        {                    
            $('#_w').text($(window).width());
        
        }
    
        $(window).resize(function(){
        
            resize_get();
        
        });
        
        $(document).ready(function(){
        
            resize_get();
        
        });
        
    
    </script>
    
    <div id='_w' style='text-align:right; border:1px solid #808008; background-color:#fff; position:fixed; top:2px; right:0px; z-index:10000'></div>