JSP中如何利用JS实现登录页面的跳转(JSP中如何利用JS实现跳转页面)

<%!          <%
                               url =              word =          }
                      url =              word =          }
                      url =              word =          }
     %>
 
                    
                 window.location="<%=url%>";
     }
     setTimeout('jumpurl()', 4000);
     </script>