SO-21756777

by Tushar Gupta

HTML

<a class="slide-link" href="#" data-slide="0">1</a>

<a class="slide-link" href="#" data-slide="1">2</a>

<a class="slide-link" href="#" data-slide="2">3</a>

CSS

.active{
    background:red;
}

JavaScript

$('.slide-link[data-slide="0"]').addClass('active');