A bit puzzled that I cannot find on the replies
Idiomatic.js and
jQuery Core Style Guide. Addy Osmani puts those two on the very top of full list of coding styles for JavaScript in his "JavaScript Style Guides And Beautifiers" article.
I personally prefer jQuery standard, though it doesn't much differ from Idiomatic.js. But whatever standard you choose you will need a validator to check how successful you are following it. I couldn't find any for jQuery or at least Idiomatic, but eventually came up with JS_CodeSniffer
