check multiple ifield if it's blank in jquery code example

Example: check multiple ifield if it's blank in jquery

$('#Rusername, #Remail, #Rpassword, #Rpassword2').each(function() {
  if ($(this).val() == '') {
    $(this).parent().effect('shake', {times: 3}, 50).find('.verdiv').addClass('error');
  }
});