
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>倒计时</title>
<script type="text/javascript">
var timeId = window.setInterval("timeDown()", 1000);
// 1.在网页上显示:"距离2018-05-01剩余xx天xx小时xx分钟x秒"
// 2.间隔1秒,秒数发生变化
function timeDown() {
var date = new Date(2018, 4, 1, 0, 0, 0);
var times = date.getTime();
// 当前系统时间
var sysDate = new Date();
// 当前系统毫秒数
var sysTimes = sysDate.getTime();
// 毫秒差
var t = times - sysTimes;
var d = Number.parseInt(t / 1000 / 60 / 60 / 24);
var h = Number.parseInt(t / 1000 / 60 / 60 % 24);
var m = Number.parseInt(t / 1000 /60 % 60);
var s = Number.parseInt(t / 1000 % 60);
document.getElementById("timeDown").innerHTML = "距离2018-05-01剩余" + d + "天" + h + "小时" + m + "分钟" + s + "秒<br />";
if(s <= 0) {
window.clearInterval(timeId);
}
}
</script>
</head>
<body>
<div id = "timeDown"></div>
</body>
</html>