JavaScript 定时器
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>javascript 定时器</title>
</head>
<style>
.container
display: flex;
font-size: 0px;
.container > span
width: 60px;
height: 60px;
background-color: red;
margin-right: 7px;
font-size: 20px;
text-align: center;
line-height: 60px;
color: #fff;
</style>
<body>
<div class="container">
<span class="hour"></span>
<span class="minute"></span>
<span class="second"></span>
</div>
</body>
<script>
let time = 4234; // 秒
(() =>
const hourDom = document.querySelector(`.hour`);
const minunteDom = document.querySelector(`.minute`);
const secondDom = document.querySelector(`.second`);
setInterval(() =>
let hour = Math.floor(time / 3600);
let min = Math.floor(time % 3600 / 60);
let sec = time % 60;
hour = hour >= 10 ? hour : `0$hour`;
min = min >= 10 ? min : `0$min`;
sec = sec >= 10 ? sec : `0$sec`;
hourDom.innerText = hour;
minunteDom.innerText = min;
secondDom.innerText = sec;
--time;
, 1000);
)();
</script>
</html>
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