很多同学在学习NFC协议的时候，觉得NFC的规范从底层到上层的应有尽有，有点无处下手的感觉。这里就和大家分享下我曾经学习NFC规范的经验。如果有不对的地方，也请各位同学批评指正.-Many students in the learning NFC protocol, I felt the NFC specification everything from the bottom to the top, a little place to start feeling. Here and share with you I had to learn the experience of NFC specifications. If there is something wrong, please Fellow students criticism.