显示鼠标在窗口的位置。当点击左边按键时，显示鼠标输入消息，并且鼠标图形变成沙漏，点击右边按键时，退出程序-The position of the mouse in the window. When clicking on the left button, the mouse input messages and graphics into an hourglass mouse, click on the right button, exit the program