JSFiddle - React, Tailwind, and code Playground

HTML

<table id="myTbl">
<tr>
    <th></th>
    <th></th>
    <th></th>
    <th<</th>
</tr>
<tr>
    <td>label</td>
    <td>data</td>
    <td>data</td>
</tr>
</table>

JavaScript

alert($('#myTbl th').length);