Like SO's question or answer form alert message: Body must be at least 30 characters; you entered 3., the last number display the current amount of characters. For that I think that I need calculate the number and append the error message, and I can append the number to the errorPlacement's first parameter error like this:
http://jsfiddle.net/sscs1kbx/5/
errorPlacement: function(error, element) {
  var placement = $(element).data('error');
  if (placement) {
     error.append(CKEDITOR.instances.editor1.getData().replace(/<[^>]*>/g, '').length);
    $(placement).append(error)
  } else {
    error.insertAfter(element);
  }
}
I works fine when user click submit button first time, but errorPlacement is called only once at the first time submitting, so, after that, I works failed?  which method or function should I use for this goal? Thanks a lot in advance!   
 
     
    