How to get plain text data of CKEDITOR?

I try:

CKEDITOR.instances["Body"].document.getBody().getText()

It will return plain text data for me, but I found that those text data will lose "\n" !?

For example, I input some data in CKEDITOR, and click "Source" toolbar, the html code is:

<p>line one</p>

<p>line two</p>

If I call "CKEDITOR.instances["Body"].document.getBody().getText()" right now, it will return:

"line oneline two"

missing the "\n" character