how chek on click check box is checked or not using jQuery

jQuery(document).ready(function ($) {
            $('.chk').change(function () {
                if ($(this).prop('checked')) {
                    //Do stuff
                    alert('0');
                    var selectitem = parseInt($(this).closest('.accordion-group').find('.selectitem').text());
                    if (selectitem != 0) {
                        $(this).closest('.accordion-group').find('.selectitem').text(selectitem - 1);
                    }
                    else {
                        $(this).closest('.accordion-group').find('.select').show();
                    }
                }
                else {
                    var selectitem = parseInt($(this).closest('.accordion-group').find('.selectitem').text());
                    $(this).closest('.accordion-group').find('.selectitem').text(selectitem + 1);
                    $(this).closest('.accordion-group').find('.select').show();

                }
            });
        });