JS缺少对象错误

[Aaronberg]

<span id="timer">5</span>秒后为您跳转服务页面。

<script type="text/javascript">
var timer_id = setInterval("go()",1000);
function go()
{

var timer_obj = document.getElementById(timer);
var num = timer_obj.innerHTML;
num -= 1 ;
timer_obj.innerHTML = num;
if (num == 0)
{
cleatInterval(timer_id);
open("manger.html","_self");
}
}

</script>
提示我改颜色那行缺少对象 我觉得没错啊。。。 菜鸟求大神指点

[Aaronberg]

发完就发现了 自己太二了

[xiaojunjor]

document.getElementById("timer");