Jquery几秒自动跳转

1.  $(document).ready(function() {    
2.             function jump(count) {    
3.                 window.setTimeout(function(){    
4.                     count--;    
5.                     if(count > 0) {    
6.                         $('#num').attr('innerHTML', count);    
7.                         jump(count);    
8.                     } else {    
9.                         location.href="login.jsp";    
10.                     }    
11.                 }, 1000);    
12.             }    
13.             jump(3);    
14.         });