JSPspEmu Git (2014/05/01) is released. JSPspEmu is a PSP emulator made using javascript (actually typescript). It will work with any modern browser. Though the first version work only works with Chrome (desktop and android). At this point it can run some demos.

JSPspEmu Git Changelog:
* - Fixed samples
* - Created a flag to enable/disable optimizations
- Added a new optimization for calling functions. This will improve performance, because you can call other functions inside a loop without breaking the loop and returning to the main slow execution loop. At this point, loops still don't have conditionals and doesn't support optimizing nested loops. But this is a start. Next steps would be converting functions into state machines and in a later step optimizing into loops and ifs (in the case it is possible) as emscripten does.

Try online: JSPspEmu Git (2014/05/01)
Source: Here