首先再次声明我是菜鸟，我写出来的目的是给没有接触过lcd的朋友看得，我本人水平有限，错误在所难免，欢迎指出。-First of all, once again declare that I am a rookie, I write is designed to not come into contact with lcd friends to see, I am limited, error is inevitable, welcome to point out.