<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>自动跳转</title>
<style>
p{
text-align: center;
}
span{
color: red;
}
</style>
</head>
<body>
<p>
<span id="time">5</span>秒后自动跳转.......
</p>
<script>
var second = 5 ;
var time = document.getElementById("time");
function showTime() {
second--;
if(second <= 0){
location.href = "https://www.baidu.com"
}
time.innerHTML=second+"";
}
setInterval(showTime,1000);
</script>
</body>
</html>原文：https://www.cnblogs.com/newcityboy/p/11406238.html