VB鼠标坐标点获取，XY坐标信息，随着鼠标的移动，XY坐标会分别显示在程序窗口的方框内，并可限制鼠标只在本窗口的范围内移动。-VB point obtaining mouse coordinates, XY coordinate information, with the movement of the mouse, XY coordinates will show in the box of the program window, and can restrict mouse movement