js实现页面多个日期时间倒计时效果

<style>
  .mytime{ line-height: 40px; width: 300px; margin: 0 auto;}
 </style>

<div class="mytime jsTime" data-time="2019-04-01 16:58:00">时间1</div>
<div class="mytime jsTime" data-time="2019-04-04 18:00:02">时间2</div>
<div class="mytime jsTime" data-time="2019-04-05 19:01:31">时间3</div>
<div class="mytime jsTime" data-time="2019-04-06 05:05:15">时间4</div>
<div class="mytime jsTime" data-time="2019-04-07 09:01:43">时间5</div>
<hr>
<div class="mytime jsTime2" data-time="2019-04-08 16:30:05">时间1</div>
<div class="mytime jsTime2" data-time="2019-04-09 14:01:22">时间2</div>
<div class="mytime jsTime2" data-time="2019-04-10 18:06:25">时间3</div>
<div class="mytime jsTime2" data-time="2019-04-11 22:07:19">时间4</div>
<div class="mytime jsTime2" data-time="2019-04-12 23:12:38">时间5</div>

<!-- 方法1 -->
<script>
 const countdown = {
  domList : document.querySelectorAll('.jsTime'),
  formatNumber(n){
   // return n.toString().padStart(2, '0'); // 用padStart方法要注意兼容问题
   n = n.toString();
   return n[1] "htmlcode">

<!-- 方法2 -->
<script>
 //时间格式处理
 const formatNumber = n => {
 n = n.toString();
 return n[1] "nofollow" target="_blank" href="https://github.com/xiexikang/js-date-countdown" rel="external nofollow" target="_blank">github

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