双十一：js倒计时

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我是靠谱客的博主调皮水蜜桃，最近开发中收集的这篇文章主要介绍双十一：js倒计时，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述


<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    .time-item {
      width: 450px;
      height: 45px;
      margin: 0 auto;
    }
    
    .time-item strong {
        background: orange;
        color: #fff;
        line-height: 49px;
        font-size: 36px;
        font-family: Arial;
        padding: 0 10px;
        margin-right: 10px;
        border-radius: 5px;
        box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
    }

    .time-item > span {
        float: left;
        line-height: 49px;
        color: orange;
        font-size: 32px;
        margin: 0 10px;
        font-family: Arial, Helvetica, sans-serif;
    }
    .title {
      width: 260px;
      height: 50px;
      margin:200px auto 50px auto;
    }
  </style>

</head>
<body>
  <h1 class="title">距离光棍节，还有</h1>
  
  <div class="time-item">
    <span><span id="day">00</span>天</span>
    <strong><span id="hour">00</span>时</strong>
    <strong><span id="minute">00</span>分</strong>
    <strong><span id="second">00</span>秒</strong>
  </div>
  <script>

    // 目标时间的时间戳
    var endDate = new Date('2019-11-11 0:0:0');
    var end = endDate.getTime();

    // 获取天时分秒的盒子
    var spanDay = document.getElementById('day');
    var spanHour = document.getElementById('hour');
    var spanMinute = document.getElementById('minute');
    var spanSecond = document.getElementById('second');

    // 开启定时器
    setInterval(countdown, 1000);

    countdown();
    // 倒计时
    function countdown() {     
      // 当前时间的时间戳
      var nowDate = new Date();
      var now = nowDate.getTime();

      // 计算时间差（毫秒）
      var leftTime = end-now; 
      // 相差的秒数
      leftTime /= 1000;

       // 求 相差的天数/小时数/分钟数/秒数
	  var day, hour, minute, second;

	  day = Math.floor(leftTime / 60 / 60 / 24);
	  hour = Math.floor(leftTime / 60 / 60 % 24);
	  minute = Math.floor(leftTime / 60 % 60);
	  second = Math.floor(leftTime % 60);
      
      // 设置盒子的内容
      spanDay.innerText = day;
	  spanHour.innerText = hour;
	  spanMinute.innerText = minute;
	  spanSecond.innerText = second;

    }
  </script>
</body>
</html>