JSFiddle - React, Tailwind, and code Playground
HTML
<div id="test" class="fff aaa ccc" >hello world</div><br /><br />
JavaScript
$(function()
{
// Has the #test a Class?
if ($('#test').attr('class') != '')
{
// Read classes
var all_classes = $('#test').attr('class');
// Output
$('body').append('Classnames: '+all_classes+' ');
}
}):