From last year, because it is too long, there is always no way to read it, plus it and the second version of the majority of the same, read more interested in a little bit.
Compared with the second version, its biggest change is to add a lot of HTML5 content, such as: Something new Object objects, data properties, accessor properties and some corresponding methods, such as its comparison and summary of common cross-domain methods: POSTMESSAGE,IE8 XDR, upgraded XHR, JSONP cross-domain principle, one-way picture ping, such as some introduction to data push, long polling and HTTP flow is what it looks like, one-way SSE and two-way Web sockets detailed introduction and comparison.
PS, about SSE, last year O ' Reilly published a book called "HTML5 Data Push application development", focusing on SSE and low-version downgrade scenarios.
[Read] JavaScript Advanced Programming (3rd edition)