JSPspEmu Git (2014/05/05) 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:
- small update
- Small fullscreen tune
- Removed old tests (now using the ones from pspautotests)
- Improved usability on touch devices (showing touch buttons just on touch devices)
- Fullscreen by default
- Small changes
- Small fixes
- Vertex decoding speedup
- Pixelformat decoding speedup
- BifferedAsyncStream to improve performance streaming games
- Some more stubs
- Added PSPTris
- Some more ModuleMgrForUser stubs
- Huge speedups on vertex decoding
- Added MediaEngine.js
- Atrac3+ decoding
- Fixed buttons.ttf on some browsers
- Added Math.imul32_64 and Math.umul32_64
- Huge multiply speedup
- Some fixes

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