随着移动设备的普及以及信息的流动*互等需求，二维码越来越普及。任何的产品信息、网址、名片以及文字内容都可以通过二维码转化成黑白密码图片实现。-With the popularity of mobile devices, as well as the flow of information and interaction needs is becoming increasingly popular, two-dimensional code. Any product information, website, business cards, and text can be converted into two-dimensional code black and white password picture.