SO - 21347155

by Arun P Johny

HTML

<ul class="list">
    <li>1</li>
    <li class="foo">2</li>
    <li class="foo">3</li>
    <li class="foo">4</li>
    <li>5</li>
</ul>

CSS

.selected {
    color: red;
}

JavaScript

$('.list li.foo').filter(':first, :last').addClass('selected')