JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css">
<div>
  <a class="h-icon" href="#">
    <i class="fa fa-heart-o" aria-hidden="true"></i>
  </a>
</div>

<div>
  <a class="h-icon" href="#">
    <i class="fa fa-heart-o" aria-hidden="true"></i>
  </a>
</div>

<div>
  <a class="h-icon" href="#">
    <i class="fa fa-heart-o" aria-hidden="true"></i>
  </a>
</div>

<div>
  <a class="h-icon" href="#">
    <i class="fa fa-heart-o" aria-hidden="true"></i>
  </a>
</div>

<div>
  <a class="h-icon" href="#">
    <i class="fa fa-heart-o" aria-hidden="true"></i>
  </a>
</div>

<div>
  <a class="h-icon" href="#">
    <i class="fa fa-heart-o" aria-hidden="true"></i>
  </a>
</div>

JavaScript

$(".h-icon").on("click", function(e) {
  e.preventDefault();

  $("i", this).toggleClass("fa-heart fa-heart-o");

  $.ajax({
    url: $(this).prop("href")
  })
  return false;
});