倒计时3秒后 自动跳转到 百度
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>javascript</title>
<script>
function fo(){
var vs = document.getElementById('s');
var str = vs.innerHTML;
str = parseInt(str);
if(str>0){
str--;
vs.innerHTML = str;
}else{
clearInterval("interval");
location.href="https://www.baidu.com/";
}
}
var ineterval = setInterval('fo()',1000);
</script>
</head>
<body>
<span id="s" style="color: cornflowerblue;font-size: 30px;">3</span>
<span>秒后自动跳转</span>
</body>
</html>
