Can spiders crawl javascript navigation now?

[Sika22]

I was reading Danny Dover's book and decided to try some websites and so far everyone I have looked at has had navigation that does not work with disabled javascript.  Is this still as important as it was at the time of publish (2011)?  Thanks!

[MoosaHemani]

In the light of this article (http://searchengineland.com/google-can-now-execute-ajax-javascript-for-indexing-99518), I can say that Google can crawl the content in Javascript (few of it, if not all).

Hope this helps!!