JSFiddle - React, Tailwind, and code Playground

HTML

<table border="1" class="tableMenu">
    <tr>
        <td>1</td>
        <td>2</td>
    </tr>
    <tr>
        <td>3</td>
        <td>4</td>
    </tr>
    <tr>
        <td>5</td>
        <td>6</td>
    </tr>
</table>

<br>
<table border="1" class="tableMenu">
    <tr>
        <td>1</td>
        <td>2</td>
    </tr>
    <tr>
        <td>3</td>
        <td>4</td>
    </tr>
    <tr>
        <td>5</td>
        <td>6</td>
    </tr>
</table>

CSS

.tableSubMenu{
    background-color : red;
}

JavaScript

$('table.tableMenu').each(function(){
    $(this).find("tr:odd").addClass('tableSubMenu');
});