贪吃蛇大作业相关

https://blog.csdn.net/weixin_52142731/article/details/110477154      Sleep函数用法

https://blog.csdn.net/zhao_fu_lu/article/details/23961111    initgragh函数用法

https://zhidao.baidu.com/question/470277767.html   BeginBatchDraw批量绘图函数用法;FlushBatchDraw()

https://blog.csdn.net/u012372584/article/details/53837899   GetKeyState函数用法

https://docs.easyx.cn/en-us/setfillcolor    setfillcolor色彩填充函数

https://docs.easyx.cn/en-us/solidrectangle  solidrectangle函数