:even Selector

Selects even elements, zero-indexed. See also :odd.

.even()

As of jQuery 3.4, the :even pseudo-class is deprecated. Remove it from your selectors and filter the results later using .even() (available in jQuery 3.5.0 or newer).

In particular, note that the 0-based indexing means that, counter-intuitively, :even selects the first element, third element, and so on within the matched set.

Finds even table rows, matching the first, third and so on (index 0, 2, 4 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: #eee;
}
HTML
$("tr:even").css("background-color", "#bbf");
DEMO

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