Auto refresh div using JQuery

<script src="https://code.jquery.com/jquery-2.1.1.min.js" type="text/javascript"></script>
        <script>
        $(document).ready(function(){
        setInterval(function(){
        $("#set").load('refresh.php')
        }, 1000);
        });
        </script>   
      
       <div id="set"></div>