二维码生成

转载:https://www.cnblogs.com/aston/p/7501895.html#4073349

转载:http://www.imooc.com/learn/531

转载:https://www.cnblogs.com/lanxiamo/p/6293580.html

原文地址:https://www.cnblogs.com/ConfidentLiu/p/9847977.html