拿来验证qt环境是不错的，测试过win10+Qt4.8.0 + Qt Creator 2.4.1 + mingw4.4.0，linux3.2+qt4.8.3(Used to verify qt environment is good, tested win10 + Qt4.8.0 + Qt Creator 2.4.1 + mingw4.4.0, linux3.2 + qt4.8.3)

1602的渐入式显示，逐个字符的显示，1602自备中文库(1602 of the progressive display, one by one character display, 1602 owned Chinese Library)