<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>www.jb51.net JS倒计时</title>
</head>
<body>
<div id="div"></div>
<script type="text/javascript">
setInterval(function() {
var html = clock(true, true, true, false, "", "2019/8/7 00:00")
console.log(html)
}, 1000)
function clock(day, hour, min, sec, startDate, endDate) {
//参数依次为是否返回天数，小时数，分钟数，秒数以及开始时间，结束时间
var nowDate = startDate == "" ? new Date().getTime() : new Date(startDate).getTime() //当前日期时间戳毫秒数
var stopDate = new Date(endDate).getTime() //指定日期时间戳毫秒数
var gapDate = stopDate - nowDate //相差时间戳毫秒数
var haveDay = addZero(Math.floor(gapDate / 1000 / 3600 / 24)) + "天" //相差天数
var haveHour = addZero(Math.floor(gapDate % (1000 * 3600 * 24) / (1000 * 3600))) + "时" //相差小时数
var haveMinutes = addZero(Math.floor(gapDate % (1000 * 3600) / (1000 * 60))) + "分"
var haveSeconds = addZero(Math.floor(gapDate % (1000 * 60) / 1000)) + "秒"
var returnDate = (day ? haveDay : "") + (hour ? haveHour : "") + (min ? haveMinutes : "") + (sec ? haveSeconds : "")
function addZero(num) {
//补零
return num < 10 ? "0" + num : num
}
return returnDate;
}
</script>
</body>
</html>
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