JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bar">
  <div id="h2"> 01 </div>
  <div id="h2"> 02 </div>
  <div id="h2"> 03 </div>
  <div class="h1"> 1
    <div id="a1"> 8 </div>
  </div>
  <div id="h2"> 2 </div>
</div>

JavaScript

var last= $('#bar > div:last-child').clone(),
    inner = $('#a1').clone();

$('#bar > div:last').remove();
$('#bar').append(inner);

$('.h1').children().remove();
$('.h1').append(last);