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

$(function(){
    
$("table tr").click(function(){
    alert (this.rowIndex);
});
});