JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<ul class="menu">
    <li><a href="#">Link 1</a></li>
    <li><a href="#">Link 2</a></li>
    <li><a href="#">Link 3</a></li>
</ul>

CSS

.currentMenu { border: solid 1px red; }

JavaScript

$("ul.menu li a").click(function() {
  $("ul.menu li a").not(this).removeClass("currentMenu");
  $(this).toggleClass("currentMenu");
});