JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<h1>Welcome to My Web Page</h1>

<table id="mytab1" border="1">
  <tr>
    <th>Company</th>
    <th>Country</th>
  </tr>
  <tr>
    <td>Alfreds Futterkiste</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Berglunds snabbköp</td>
    <td>Sweden</td>
  </tr>
  <tr>
    <td>Centro comercial Moctezuma</td>
    <td>Mexico</td>
  </tr>
  <tr>
    <td>Ernst Handel</td>
    <td>Austria</td>
  </tr>
  <tr>
    <td>Island Trading</td>
    <td>UK</td>
  </tr>
</table>

JavaScript

$(document).ready(function(){
		/*this is jQuery Way to find even rows*/
    $("tr:even").css("background-color", "yellow");
    
    /*this is using javascript*/
    var table = document.getElementById("mytab1");
    for (var i = 0, row; row = table.rows[i]; i++) {
       if(i%2==0){
       		/*even row*/
          console.log(row)
       }else{
       		/*odd row*/
       }
    }
});