In Cocos2d-html5 v3.0a, we have refactored
cc.SpriteFrameCache to a singleton object
cc.spriteFrameCache, to identify the difference between an object and a class, the first s is lowercased, so it is not a typo.
And JSB now follows the html5 APIs, we are preparing all docs for the release of Cocos2d-html5 v3.0 along with the JSB v3.0, it will be released in this week. Please be patient and keep an eye on our site.