摘要：1. give a description of QR Code before 2013/1/1I get a description doc in details from baidu doc: http://wenku.baidu.com/view/5c4c28e9856a561252d36f6e.htmlBesides, I store a copy in baiduYun: http://pan.baidu.com/s/1d6BUp Done!2. recommend a good article of garbage collector.http://journal.stuffwi. 阅读全文