javascript完美倒计时5秒

<p class="reg-success-p2">请牢记您的信息，页面<span class="red">  <span  id="time">5</span>s  </span>后将跳转到登录页面</p>

-------------------------------------javascript
<script type="text/javascript">
$(function(){
var i=5;
djs(i);
});
  function djs(i){
        i-=1;
        document.getElementById("time").innerText = i;
        if(i==0){
        window.location.href="/shzb/login.xhtml";
        }
        setTimeout("djs("+i+")",1000);
        //用这个也可以
        //setTimeout(djs(i),1000);
    }
</script>