jquery checkbox 활용 방법

        // name으로 가져와서 체크 여부 확인

        $("input:checkbox[name='chk_sel']").each(
            function(){
                if($(this).is(":checked")){
                    var rRowIndex = $(this).attr( id ).split( _ )[$(this).attr( id ).split( _ ).length-1];
                    if (para_sub != "")
                        para_sub += ",";
                    para_sub += { ;
                   para_data += '        "service_kind":' + ($("#is_check_" + rRowIndex).is(":checked") ? "1" : "0");

                    para_sub += } ;
                    rowCount++;
                }
            }
        )


        if(!$('#chk').is(":checked")){
            $('#chk').focus();
            return false;
        }