javascript跨域访问

<script type="javascript">      

      var element;

      function onload() {
            element = document.createElement('script');
            element.setAttribute('src', 'http://10.10.11.18:80/ris/Login.aspx');
            document.body.appendChild(element);     
        }
        function Domain() {
            alert(element);
        }

</script>