完成自动关机功能，设定好时间，点击“关机”按钮，时间到就自动关机了，代码写的挺不错的，大家有想学习的，下载研究一下吧-Complete automatic shutdown, set a good time, click on the " off" button, the time to automatically shut down, the code written in very good, we may have wanted to learn, look it dow