My fix doesn't actually fix the "/* */" issue, unfortunately. However, it doesn't break "//" either; note that comment-multi-line is t for e.g. c-mode, and comment-indent-new-line works for "//" there.

On Mon, Aug 9, 2010 at 4:33 AM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
> js-mode doesn't set the comment-multi-line variable. This results in
> comment-indent-new-line behaving improperly when used in a multi-line
> comment, which also affects auto-fill-mode, according to the documentation
> for comment-multi-line.

If I understand and remember correctly, this is not the right fix for
your problem: setting comment-multi-line to t will fix your problem with
"/*..*/" but will introduce another for "//....\n" and vice-versa.


       Stefan