JSFiddle - React, Tailwind, and code Playground
by lollero
HTML
<h2 class="acc_trigger a"></h2>JavaScript
var clslen = $('h2').attr('class').split(' ').join(',');
var len = clslen.indexOf(',');
if( len > 0){
alert('elem has more than one class');
}else{
alert('elem has just one class');
}