:odd Selector
Selects odd elements, zero-indexed. See also :even.
.odd()
As of jQuery 3.4, the :odd pseudo-class is deprecated. Remove it from your selectors and filter the results later using .odd() (available in jQuery 3.5.0 or newer).
In particular, note that the 0-based indexing means that, counter-intuitively, :odd selects the second element, fourth element, and so on within the matched set.
Finds odd table rows, matching the second, fourth and so on (index 1, 3, 5 etc.).
JS
<table border="1">
<tr>
<td>Row with Index #0</td>
</tr>
<tr>
<td>Row with Index #1</td>
</tr>
<tr>
<td>Row with Index #2</td>
</tr>
<tr>
<td>Row with Index #3</td>
</tr>
</table>
CSS
table {
background: #f3f7f5;
}
HTML
$("tr:odd").css("background-color", "#bbbbff");
DEMO