JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tbody>
        <tr id="hello">
          <td>.1.</td>
          <td>.2.</td>
          <td>.1.</td>
          <td>.2.</td>
        </tr>
   </tbody>
</table>

JavaScript

$("table tbody tr[id='hello']").find("td").attr("class","data");