话不多说，直接上代码
<html>
<head>
<title>倒计时</title>
</head>
<body>
<div id="time1"></div>
<p>-----------------------</p>
<div id="time2"></div>
</body>
<script src="https://code.jquery.com/jquery-3.4.0.min.js"></script>
<script type="text/javascript">
window.onload = function () {
endTime();
}
function endTime() {
var myDate = new Date();
var timestamp = Date.parse(myDate) / 1000;
var date = myDate.getDate();
var year = myDate.getFullYear();
var month = myDate.getMonth() + 1;
var endtime1 = year + '-' + month + '-' + date + ' 12:00:00';
var endtime2 = year + '-' + month + '-' + date + ' 18:00:00';
var time1 = Date.parse(new Date(endtime1)) / 1000;
var time2 = Date.parse(new Date(endtime2)) / 1000;
if(time1 > timestamp) {
$('#time1').text(time1 - timestamp +'S');
}
if(time2 > timestamp) {
$('#time2').text(time2 - timestamp +'S');
}
setTimeout("endTime()", 1000);
}
</script></html>
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