JSFiddle - React, Tailwind, and code Playground
HTML
<a id="demo" class="footer_default">a</a>
JavaScript
$('a').click(function () {
console.log($($(this)).hasClass("footer_default"))
console.log($(this).hasClass("footer_default"))
});
<a id="demo" class="footer_default">a</a>
$('a').click(function () {
console.log($($(this)).hasClass("footer_default"))
console.log($(this).hasClass("footer_default"))
});