案例：京东倒计时效果

倒计时

<!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>
       div {
           width: 200px;
           height: 200px;
           background-color: pink;
           margin: 100px auto;
           float: left;
           padding: 20px;
           font-size: 90px;
       }
    </style>
</head>
<body>
    <div class = "hour"></div>
    <div class="minite"></div>
    <div class="second"></div>
    <script>
        var hour = document.querySelector('.hour');
        var minite = document.querySelector('.minite');
        var second = document.querySelector('.second');
         var inputTime = +new Date('2019-5-1 18:00:00'); //返回的是用户输入事件总的毫秒数
         countDown();//我们先调用一次这个函数 防止第一次 刷新页面有空白
         setInterval(countDown,1000);
        function countDown() {
            var nowTime = +new Date();//返回的是当前时间总的毫秒数
            
            var times = (inputTime - nowTime)/1000; //times是剩余时间的总秒数
            var h = parseInt(times / 60 /60 % 24); //时
            h = h < 10 ? '0' + h : h;
            hour.innerHTML = h;//把剩余的小时数 给小时黑色盒子
            var m = parseInt(times / 60 % 60); //分
            m = m < 10 ? '0' + m : m;
            minite.innerHTML = m;
            var s = parseInt(times % 60); //当前的秒
            s = s < 10 ? '0' + s : s;
            second.innerHTML = s;
        }
        
    </script>
</body>
</html>

 

posted @ 2020-06-05 14:18  qiuqiu95  阅读(419)  评论(0)    收藏  举报