via http://www.emucr.com/

1964js Git (2015/06/06) is released. 1964js is the first N64 emulator written in JavaScript (CoffeeScript to JS). It is loosely a port of our N64 emulator for Windows called 1964. 1964 was written in C and C++.

1964js Git Changelog:
* Create libraries README
* Clean up a few characters

http://emu-1964.appspot.com/