QR二维码的编写规则，可据此编写QR二维码生成与识别算法-The preparation of two-dimensional QR code rules, then be able to write two-dimensional QR code generation and recognition algorithm

QR二维码编码与解码，（二维码的生成、二维码的读取识别、乱码问题解决方法）-QR code coding and decoding