JSFiddle - React, Tailwind, and code Playground

HTML

<div class="oldClass" title="qwerty">qwerty</div>

CSS

.oldClass {
     border: 1px solid red;
 }
 .newClass {
     border: 3px solid green;
 }

JavaScript

var func = function(){
    $('.oldClass').off().on('click', function () {
        $(this).toggleClass('oldClass').toggleClass('newClass');
        $('.newClass').off().on('click', function () {
            $(this).toggleClass('newClass').toggleClass('oldClass');
            alert('1');
            func();
        });
    });
};

$(function () {
 func();
});