http://icyfenix.iteye.com/blog/1052904
http://bellard.org/jslinux/
太强大了，运行在浏览器上面得linux
This PC emulator is written in Javascript. The emulated hardware consists in the following devices:
- 32 bit x86 compatible CPU
- 8259 Programmble Interrupt Controller
- 8254 Programmble Interrupt Timer
- 16450 UART
- Real Time Clock.
The code is written in pure Javascript using the W3C Typed Arrays. A slightly slower fallback mode is implemented for browsers missing this support. For the exact list of supported browsers, see the FAQ. In any case, a fast Javascript engine is needed to have good performance.