JSFiddle - React, Tailwind, and code Playground

HTML

<html>
  <body>
    <div class="content">
      <button class="button">button</button>
      <a href="#somewhere" class="post-link">Post</a>
    </div>
  </body>
</html>

JavaScript

$('.button').on('click', function() {
	$(this).parent().find('.post-link').attr('href', '#hello-world')
})