Jquery: html form at least one check box should be checked

1. Code For At least one check-box should be selected:

jQuery(document).ready(function () {
        jQuery('.checkOrder').click(function() {
          checked = jQuery("input[type=checkbox]:checked").length;
    
          if(!checked) {
            jQuery('#advice-required-entry-order_id').html("At least one order must be checked!");
            return false;
          }
        });
});

2.Code For if you select another check-box the fist one will unchecked:

jQuery(document).ready(function () {
jQuery(':checkbox').on('change',function(){
            var th = jQuery(this), name = th.prop('name'); 
            if(th.is(':checked')){
                jQuery(':checkbox[name="'  + name + '"]').not(jQuery(this)).prop('checked',false);   
            }
        });
});