Checking if checkbox is checked or not.

<input id = "checkbox1" type = "checkbox" name = "one" value = "1" checked = "checked">
<input id = "checkbox2" type = "checkbox" name = "two" value = "2">
<input id = "checkbox3" type = "checkbox" name = "threr" value = "3">

$('#checkbox1').prop('checked'); 

$('#checkbox2').prop('checked');