JSFiddle - React, Tailwind, and code Playground
HTML
<div>test</div>
JavaScript
var d = $('div');
d.addClass("a a");
d.removeClass("a");
console.log( 'hasClass: %o, className: %o', d.hasClass('a'), d[0].className );
//example
d[0].className = '';
d.addClass("a");
d.addClass("a");
d.removeClass("a");
console.log( 'hasClass: %o, className: %o', d.hasClass('a'), d[0].className );