setInterval() 倒计时插件

作者: 王远清orz | 来源:发表于2019-11-18 10:38 被阅读0次

setInterval() 倒计时插件
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JS定时器

<style>
    .time-item {
      width: 430px;
      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>
<body>
  <h1 class="title">距离圣诞节，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>
    // 获取目标时间的时间戳
    var endTime = (new Date('2019-12-25')).valueOf();
    var spanDay = my$('day');
    var spanHour = my$('hour');
    var spanMinute = my$('minute');
    var spanSecond = my$('second');
    // 获取时间差
    function getInterval(start, end) {
      var interval = end - start;
      interval /= 1000;
      var day, hour, minute, second;
      day = Math.round(interval / 60 / 60 / 24);
      hour = Math.round(interval / 60 / 60 % 24);
      minute = Math.round(interval / 60 % 60);
      second = Math.round(interval % 60)
      return {
        day: day,
        hour: hour,
        minute: minute,
        second: second
      }
    }

    //先初始化执行一次
    countdown();

    // countdown  这里不能写成countdown(),这个是函数调用,会立即执行
    var timeId = setInterval(countdown, 1000);

    function countdown() {
      // 获取当前时间的时间戳
      var startTime = (new Date()).valueOf();
      var interval = getInterval(startTime, endTime);
      //处理innerText兼容
      setInnerText(spanDay, interval.day);
      setInnerText(spanHour, interval.hour);
      setInnerText(spanMinute, interval.minute);
      setInnerText(spanSecond, interval.second);
    }

  </script>
</body>