JSFiddle - React, Tailwind, and code Playground

HTML

<table>  
  <tr id="25">
    <td class="remain"></td>
    <td>Something</td>
  </tr>
  <tr id="30">
    <td class="remain"></td>
    <td id='hello'>Something else</td>
  </tr>
</table>

JavaScript

$(document).ready(function(){  
  $('tr[id]').each(function () {
     var $this = $(this);
     var count = parseInt($this.attr("id"));
     countdown = setInterval(function(){
         $('.remain', $this).html(count + " seconds remaining!");
         if (count-- == 0) {
           //do something
           clearInterval(countdown);
           $('#hello').text('hello');
         }
     }, 1000);
  });  
});