为什么不倒计时啊
<!DOCTYPE html>
<html>
<head>
<title>浏览器对象</title>
<meta http-equiv="Content-Type" content="text/html; charset=gkb"/>
<style>
#txt1{
color:black;
font-size:20px;
font-weight:bold;
}
#txt2{
font-size:18px;
}
</style>
</head>
<body>
<div>
<span id="txt1">操作成功<br/><br/></span>
<span id="txt2"><span id="count">5</span>秒后回到主页<a href="javascript:window.history.back()" id="back">返回</a></span>
</div>
<script type="text/javascript">
;
function startCount(){
var num=5;
var i;
document.getElementById("count").innerHTML=num;
num=num-1;
if(num==0){
clearTimeout(i);
window.location.assign("www.imooc.com");
}
else{
i=setTimeout("startCount()",1000);
}
}
</script>
</body>
</html>
