SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div id="wrap">
    <div class="div-1">1</div>
    <div class="div-2">2</div>
    <div class="div-3">3</div>
</div>

JavaScript

var elements = ['.div-1', '.div-3'];
$(elements.join(', ')).fadeOut(2000);