JSFiddle - React, Tailwind, and code Playground

HTML

<li><a href="index.php?#1">1</a></li>
    <li><a href="index.php?#2">2</a></li>
    <li><a href="index.php?#3">3</a></li>

CSS

.red {
    color: red;
}

JavaScript

$('a').click(function(){
       $('a').removeClass('red')
       $(this).addClass('red');
    
    return false;
    })