Get Values from Checkbox in Jquery

$('#checkBox').attr('checked');

$('#edit-checkbox-id').is(':checked');

var checked = $('input[type=checkbox]').is(':checked');

var checkbox_value = $('#check_box_id:checked').val();

$("input[@type=checkbox][@checked]").each(

function() {
   // Insert code here
   }

);

//
$("input[type=checkbox][checked]").each(

function() {
   // Insert code here
   }
);
$('input[name=foo]').is(':checked')
$('input[name=foo]').attr('checked')
$('input[name=foo]').attr('checked', true);
$('input[name=foo]').attr('checked', false);


$(document).ready(function(){

$('#submit_button').click(function() {

if (!$("input[@name='name']:checked").val()) {
   alert('Nothing is checked!');
   return false;
}

else {
   alert('One of the radio buttons is checked!');
}

});
});