JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>1</td><td>1</td><td>1</td>
    </tr>
    <tr>
        <td>2</td><td>2</td><td>2</td>
    </tr>
    <tr>
        <td>3</td><td>3</td><td>3</td>
    </tr>
</table>

JavaScript

var trs = document.getElementsByTagName('tr');

for (var i = 0; i < trs.length; i++) {
    trs[i].onclick = clickHandler;
}

function clickHandler(event) {
    alert(event.target.innerText);
}