JQuery实现N秒自动跳转

$(document).ready(function() {
            function jump(count) {
                window.setTimeout(function(){
                    count--;
                    if(count > 0) {
                        $('#num').html(count);
                        jump(count);
                    } else {
                        location.href="login.jsp";
                    }
                }, 1000);
            }
            jump(5);
        });