说明：  一个比较好用的二维码控件及Demo。 感觉比很多地方的二维码控件都要好用一些。 不过需要注意一点：对于中文的支持还不是很好。
(A relatively easy to use two-dimensional code control and Demo. Feeling than many parts of the two-dimensional code number of the control to be easy to use. But note that: For Chinese support is not good.)