JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="things">
    <li class="thing1">1</li>
    <li class="thing2">2</li>
    <li class="thing3">3</li>
</ul>

JavaScript

function Thing(el) {
    $(document).ready(function() {
        alert($(el).attr('class'));
    });
}

$(document).ready(function() {
    $('#things li').each(function() {
        var thing = new Thing(this);
    });
});