主要演示利用AlphaBlend 函数把一幅图片进行透明过渡处理，以达到应有的动画切换特效，基本思路可以看代码。代码相对来说比较简单，初学者应该可以看得懂。-The main demonstration of the use of a picture AlphaBlend function to handle the transition to transparent in order to achieve proper switching animation effects, the basic ideas can see the code. Code is relatively simple, beginners should be able to understand.