JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/fancybox/2.1.5/jquery.fancybox.js"></script>
<link rel="stylesheet" href="http:  //cdnjs.cloudflare.com/ajax/libs/fancybox/2.1.5/jquery.fancybox.min.css">
<div class="menu">
    <ul>
        <li class="menu-li active">
        <a>Menu 1</a>
        </li>
        <li class="menu-li">
        <a>Menu 2</a>
        </li>
        <li class="menu-li">
        <a>Menu 3</a>
        </li>
    </ul>
    <input type="button" class="check"/>
</div>

JavaScript

jQuery.('.check').click(function(){
    alert('chau');
   
})