JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <a href="#">lorem ipsum</a>
    <a href="#">lorem ipsum</a>
</div>

CSS

.newClassName {
    color: red;
}

.newClassName1 {
    color: blue;
}

JavaScript

$$('#container a').each(function(link){
    link.addEvents({
        click: function(e){
            e.stop();
            
            this.set('class', 'newClassName');
            this.removeClass('newClassName');
        }
    });
});