如题↑ 怎么实现??
blend吗?怎么能让图片渐渐显示出来呢?

on mouseEnter me
repeat with i = 0 to 100
sprite(me.spriteNum).blend = i
updateStage
pauseByMS(10)
end repeat
end
on mouseLeave me
repeat with i = 100 down to 0
sprite(me.spriteNum).blend = i
updateStage
pauseByMS(10)
end repeat
end
on pauseByMs howTime
s_Time = _system.milliseconds
repeat while _system.milliseconds - s_Time < howTime
--noThing
end repeat
end