JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
  <ul>
    <li><a href="#john">John</a></li>
    <li><a href="#doe">Doe</a></li>
    <li><a href="#Jane">Jane</a></li>
  </ul>
</nav>

<section id="john">Super BuBu</section>
<section id="doe">Super Saiyan</section>
<section id="jane">Jane Porter</section>

JavaScript

window.onhashchange = function() {
    alert(window.location.hash);
};