倒计时案列-优快云博客

本文链接：https://blog.youkuaiyun.com/2301_79605560/article/details/140674198

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        span {
            font-size: 40px;
            background-color: red;

        }
    </style>
</head>

<body>
    <span class="hour">1</span>
    <span class="minute">2</span>
    <span class="second">3</span>
    <script>
        var hour = document.querySelector('.hour');
        var minute = document.querySelector('.minute');
        var second = document.querySelector('.second');
        var inputTime = + new Date('2024-8-28 12:30:00');//用户输入倒计时的时间
        function countDown() {
            var nowTime = +new Date();
            var times = (inputTime - nowTime) / 1000;
            var h = parseInt(times / 60 / 60);
            h = h < 10 ? '0' + h : h;
            hour.innerHTML = h;
            var m = parseInt(times / 60 % 60);
            m = m < 10 ? '0' + m : m;
            minute.innerHTML = m;
            var s = parseInt(times % 60);
            s = s < 10 ? '0' + s : s;
            second.innerHTML = s;

        }
        countDown();//先调用这个函数，是为了防止第一次刷新页面有空白
        setInterval(countDown, 1000);
    </script>

</body>

</html>

function()函数是获取小时，分钟和秒数的，具体背下来或者直接用就行。

运行结果如下：