onmousewheel event 缩放图片效果
发布时间：2006-09-06 作者： 来源：转载
onMouseWheelEventSample－www.51windows.NetonmousewheeleventThissampleusestheonmousewheeleventtoexpandorcontractthepicturebelow.Movethecursoroverthepictureandrollthemousewheelupanddown.Size=100%http://msdn.microsoft.com/workshop/
