这样就有了这。
--相关1. 源码:http://code.google.com/p/unitjs
2. 兴趣源:http://s3.amazonaws.com/slideshare/player.swf?useHttp=1&inContest=0&totalSlides=54&startSlide=30&presentationId=93987&doc=building-a-javascript-library2560&321