2019年春节倒计时 - JavaScript

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>春节倒计时</title>
    <style>
        body{text-align: center}
        .time{
            width: 800px;
            height: 300px;
            background-color: coral;
            margin: 0 auto;
            margin-top: 20px;
        }
        p{
            padding: 50px;
        }
    </style>
</head>
<body>
    <div class="time">
        <p style="color: cornsilk">2019年农历春节倒计时：还剩<span></span></p> 
    </div>
    <script>
            var oSpan = document.getElementsByTagName('span')[0];
            function tow(n) {
              return n >= 0 && n < 10 ? '0' + n : '' + n;
            }
            function getDate() {
              var oDate = new Date();//获取日期对象
              var oldTime = oDate.getTime();//现在距离1970年的毫秒数
              var newDate = new Date('2019/2/5 00:00:00');
              var newTime = newDate.getTime();//2019年春节距离1970年的毫秒数
              var second = Math.floor((newTime - oldTime) / 1000);//未来时间距离现在的秒数
              var day = Math.floor(second / 86400);//整数部分代表的是天；一天有24*60*60=86400秒 ；
              second = second % 86400;//余数代表剩下的秒数；
              var hour = Math.floor(second / 3600);//整数部分代表小时；
              second %= 3600; //余数代表 剩下的秒数；
              var minute = Math.floor(second / 60);
              second %= 60;
              var str = tow(day) + '<span class="time">天</span>'
                  + tow(hour) + '<span class="time">小时</span>'
                  + tow(minute) + '<span class="time">分钟</span>'
                  + tow(second) + '<span class="time">秒</span>';
              oSpan.innerHTML = str;
            }
            getDate();
            setInterval(getDate, 1000);
          </script>
          
</body> 
</html>

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