JSFiddle - React, Tailwind, and code Playground

HTML

<input id="btn1" type="button" value="test" />
<span id="ctent">test</span>

CSS

input {
    margin: 20px;
}

JavaScript

$('#btn1').click(function () {
    runOnce();
    runOnce = function () {
        $('#ctent').html('test2');
    }
});

var runOnce = function () {
    $('#ctent').html('test1');
}