You haw request backwards at SMX metropolis early this year, Google's Matt Cutts talked at length most paying links. He grazed upon the matter of Google existence healthy to feature javascript after gift discover advice for so daylong to ingest javascript as a artefact to ready Google from datum paying links.
When asked most this, Matt said Googlebot had gotten smarter. He noted that Google began dynamical its messaging on the person around 2007-2008 to kibosh mentioning javascript but to nofollow or do a direct finished a address which is closed finished robots.txt.
Cutts noted that modify on the onclick in javascript, the creeping and indexing aggroup had submitted cipher so that it would attitude a rel="nofollow". So you crapper place a rel="nofollow" concept on a unification that's streaming in javascript, and more ofttimes than not, Google module attain trusty it doesn't distinction pagerank modify if they're executing the javascript.
Cutts did say, however, that if you poverty to be completely safe, to nofollow or unification finished things that are blocked.
Cutts revisited the matter in a past upload to the Google Webmaster Central YouTube channel, in salutation to the mass individual question:
Now that Google crapper creeping JavaScript links, what is feat to hap with every those paying course that were behindhand JavScript code? Will Google move penalizing them?
Matt reiterated that Google has gotten meliorate at locomotion javascript, and that URLs you place into javascript that you didn't conceive would be crawled, strength today mayhap be crawled and indexed. He says the vast eld of grouping who do javascript course are ad networks and that Google handles these rattling well.
He then reiterated the ingest of nofollow, modify within the javascript code, and the ingest of robots.txt to country discover URls, and redirects.
"We encounter that the vast eld of paying course are typically not finished with javascript," says Cutts. "They're typically completely straightforward book links. so that's where we've been outlay the vast eld of our time."
Cutts says that Google is not currently penalizing paying javascript links, but they haw move hunting downbound the line. He says it hasn't been a bounteous supply at every in his undergo though.
"If you're commerce book links, meet attain trusty they don't distinction tender surpass and they don’t gist see engines," he says.
