图片切换-[Flash入门-遮罩动画]第3课
通过前几课的学习，我们对遮罩原理已经有了大概的了解。今天将继续来研究遮罩原理的应用。本节通过两张图片交替出现的例子，来讲解了遮罩的应用。
在舞台上放置重叠的两张图片，然后同过某种形式的切换，一张图片消失，另一张图片出现，这个过程也叫做“转场效果”。
在今天的例子中，我们演示了一个非常简单的过渡效果，目的是为了讲清楚遮罩的作用，在了解了这个方法以后，读者可以自己就制作出更为复杂生动的转场效果了。
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本节课时长3分32秒，下载文件0.98兆字节。
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