Introducing javascript to implement timer countdown

Without further ado, let’s get straight to the code.

nbsp;html>
    <meta>
    <meta>
    <meta>
    <title>Document</title>
    <p>
        <span>1</span>
        <span>2</span>
        <span>3</span>
    </p>
    <script>
        var hour = document.querySelector(&#39;.hour&#39;); //小时的黑色盒子
        var minute = document.querySelector(&#39;.minute&#39;); //分钟的黑色盒子
        var second = document.querySelector(&#39;.second&#39;); //秒数的盒子
        var inputTime = +new Date(&#39;2021-4-10 23:00:00&#39;); //返回的是用户输入的时间总的毫秒数
        // 封装好的计算时间的函数
        //先调用一次函数防止开始出现空白
        countDown();
        //开启定时器
        setInterval(countDown,1000);
        function countDown() {
            var nowTime = +new Date(); //返回的是当前时间的走毫秒数
            var times = (inputTime - nowTime) / 1000; //times是剩余时间的总数
            // var d = parseInt(times / 60 / 60 / 24); //天
            // d = d < 10 ? &#39;0&#39; + d : d;
            var h = parseInt(times / 60 / 60 % 24); //时
            h = h < 10 ? &#39;0&#39; + h : h;
            hour.innerHTML = h; //把剩余的小时给小时黑盒子
            var m = parseInt(times / 60 % 60); //当前秒
            m = m < 10 ? &#39;0&#39; + m : m;
            minute.innerHTML = m;//把剩余的分钟给盒子
            var s =parseInt(times%60);//当前秒
            s = s < 10 ? &#39;0&#39; + s : s;
            second.innerHTML = s;//把剩余的秒数给盒子
            // return d + &#39;天&#39; + h + &#39;时&#39; + m + &#39;分&#39; + s + &#39;秒&#39;;
        }
    </script>

A time conversion function is encapsulated here:

 function countDown() {
            var nowTime = +new Date(); //返回的是当前时间的走毫秒数
            var times = (inputTime - nowTime) / 1000; //times是剩余时间的总数
            var d = parseInt(times / 60 / 60 / 24); //天
            d = d <blockquote><p><strong>Related Free learning recommendations: </strong><a href="https://www.php.cn/course/list/17.html" target="_blank" textvalue="javascript学习教程"><strong>javascript learning tutorial</strong></a></p></blockquote>

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