JSPspEmu Git (2014/05/17) 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:
- Some vfpu refactorings
- sasCore
- Some gpu fixes (renamed some opcodes)
- Fixed viewport
- Small misc changes and fixes
#1 WIP VFPU - Some vfpu fixes
#5 Implemented sasCore basic functionality
- Implemented VAG ADPCM
- HleConfig with language (autodetection language based on browser's language)
- Fixed dialogs result (return 0 and set the result in a struct)

Try online: JSPspEmu Git (2014/05/17)
Source: Here