<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>倒计时</title>
</head>
<body>
<script>
// 格式化00
function forMat(t) {
return t < 10 ? "0" + t : t
}
function countDown(time) {
var currentTime = +new Date()
var futureTime = new Date(time)
var times = futureTime - currentTime
times = times / 1000 //得到时间戳-秒
var d = forMat(parseInt(times / 60 / 60 / 24)) // 天
var h = forMat(parseInt(times / 60 / 60 % 24)) // 时
var s = forMat(parseInt(times / 60 % 60)) // 分
var m = forMat(parseInt(times % 60)) // 秒
return d + "天" + h + "时" + s + "分" + m + "秒"
}
console.log(countDown("2020-5-4 00:00:00"));
</script>
</body>
</html>