JSPspEmu Git (2014/03/30) 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:
* - Added support for pspautotests
* - Small README.md update
* - Improved visual controller
* - Small fixes
* - Updated README.md
* - Some fixes
* - More work
* - Added gamepad api support
- Fixed texture cache hashing
* - Updated to work with other browsers (ArrayBuffer.slice needed to specify a size)

Try online: JSPspEmu Git (2014/03/30)
Source: Here