如何在同一个 DOM 元素上实现多个倒计时

Question

我有一个 DOM 元素，它包含来自我的数据库的值（毫秒），我想为这些值实现倒计时。例如，我可以在一个部分中有 4 个产品交易，具有不同的持续时间（以毫秒为单位），我想根据每个交易的持续时间动态创建不同的倒计时 (HH:mm:ss)。目前，持续时间值（毫秒）存储在该部分中每笔交易的隐藏输入字段中。

<input type="hidden" name="" id='duration' value="{{this.deals.duration}}">

我尝试过的方法（仅适用于一项产品交易）。期间我使用了 moment.js。还有这里的倒计时：

<script type="text/javascript">
  $(document).ready(function(){
    console.log($('#duration').val());
    var interval = 1000;
    var durations = $('#duration').val();
    setInterval(function(){
      durations = moment.duration(durations - interval, 'milliseconds');
       // console.log(durations);
      $('#countdown').text(durations.hours() + ":" + durations.minutes() + ":" + durations.seconds())
    }, interval);
  })


</script>

非常感谢:)

Answer 1

$(document).ready(function(){
  var interval = 1000;
  setInterval(function(){
    $('.duration').each(function () {
      var t = Number($(this).val()) - interval;
      if (t>=0) {
        var d = moment.duration(t, 'milliseconds');
        $(this).next('.countdown').text([
          String(d.hours()).padStart(2,'0'),
          String(d.minutes()).padStart(2,'0'),
          String(d.seconds()).padStart(2,'0')
        ].join(':'));
        $(this).val(t);
      }
    });
  }, interval);
})

input + span {
  display: block;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment-with-locales.min.js"></script>

<input type="hidden" name="a" class='duration' value="5000"><span class="countdown"></span>

<input type="hidden" name="b" class='duration' value="15000"><span class="countdown"></span>

<input type="hidden" name="c" class='duration' value="20000"><span class="countdown"></span>

Answer 2

要为这个问题添加另一个答案...

无依赖性（jQuery、Moment.js）且仅持续 24 小时（不计算天、月、年）。

function countDown(elClass) {
  let labels = document.querySelectorAll(elClass);
  let now = Date.now();
  labels.forEach((label,key) => {
  let duration = document.getElementById(label.getAttribute('for')).value;
  if(duration <= 86400000) {
    let futureDate = now + parseInt(duration);
    let counterInterval = setInterval(() => { 
      let diff = futureDate - Date.now();
      if(diff <= 0) {
        clearInterval(counterInterval);
        return;
      }
      if(diff > 0) { 
        let milliseconds = diff%1000;
        let seconds = parseInt(diff/1000)%60;
        let minutes = parseInt(diff/(60*1000))%60;
        let hours = parseInt(diff/(60*60*1000))%24;
        label.innerHTML = hours.toString().padStart(2, '0')+':'+minutes.toString().padStart(2, '0')+':'+seconds.toString().padStart(2, '0')+'<br>';
      }
    },1000);
  }
  });
}
countDown('.countdown');

<input type="hidden" name="a" id="a" class='duration' value="5000"><label for="a" class="countdown"></label>
<input type="hidden" name="b" id="b" class='duration' value="15000"><label for="b" class="countdown"></label>
<input type="hidden" name="c" id="c" class='duration' value="190000"><label for="c" class="countdown"></label>
<input type="hidden" name="d" id="d" class='duration' value="2003200"><label for="d" class="countdown"></label>
<input type="hidden" name="e" id="e" class='duration' value="20067100"><label for="e" class="countdown"></label>
<input type="hidden" name="f" id="f" class='duration' value="86023104"><label for="f" class="countdown"></label>

如何在同一个 DOM 元素上实现多个倒计时

how to implement multiple countdowns on the same DOM element

javascript

jquery

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countdown

countdowntimer