JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li class="workday">Monday</li>
    <li class="workday">Tuesday</li>
    <li class="workday">Wednesday</li>
    <li class="workday">Thursday</li>
    <li class="workday">Friday</li>
    <li>Saturday</li>
    <li>Sunday</li>
<ul>

JavaScript

$("ul li.workday").each(function(){
    $(this).click(function(){
       $(this).css("color","red"); 
    });
});