JSFiddle - React, Tailwind, and code Playground

HTML

<table border>
    <tr>
        <td>1</td>
        <td>2</td>
    </tr>
    <tr>
        <td>3</td>
        <td>4</td>
    </tr>
</table>
<output></output>
<button>next</button>

JavaScript

output = document.getElementsByTagName("output")[0];
button = document.getElementsByTagName("button")[0];
tds = document.getElementsByTagName("td");
n = 0;
function next()
{
    output.innerHTML = tds[n].innerHTML;
    n = (n + 1) % tds.length;
}
next();
button.onclick = next;