You can use something like this:
HTML:
<div><input class="yourClass" type="checkbox" value="1" checked></div>
<div><input class="yourClass" type="checkbox" value="2"></div>
<div><input class="yourClass" type="checkbox" value="3" checked></div>
<div><input class="yourClass" type="checkbox" value="4"></div>
JQuery:
$(".yourClass:checkbox").filter(":checked")
It will choose values of 1 and 3.