<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>倒计时五秒</title>
<script>function countDown(){var time =document.getElementById("Time");if(time.innerHTML ==0){window.location.href="";}else{time.innerHTML =time.innerHTML-1;}
}
window.setInterval("countDown()",1000);</script>
<style>#Time,#p{font-size:100px;text-align:center;}</style>
</head>
<body>
<p id="Time">5</p>
</body>
</html>
