http://zhidao.baidu.com/link?url=lff7FilmowvV8DW_jbJNgdauhsQTBOYnZdq1sgq349k6Uo1nTv7CZvdWR1hK7DBPnNim8J5wwU6D1X_jctH3Sq
http://www.cnblogs.com/Tally/archive/2012/05/24/2516455.html