鼠标右键的功能没写进去,这个程序主要是练下鼠标操作的,其中显示空白区域还用了个第归,写得比较简单.望大家多多指教.-right mouse button functions not included, the process is essentially practicing mouse to operate, It shows that the regional gap was spent under section 000, written in relatively simple. we hope the exhibitions.