这个效果看起来比较简单，但是效果加上合理新颖的布局也可以实现特别好看的模块，本模块的效果是鼠标经过图片遮罩显示另外一张图片，如果鼠标经过显示的图片设计为png透明图或者是一个透明色块，弄好生成在页面上就是一个遮罩效果了，如果显示的另外一个不透明的图片就算是变脸效果，最终效果主要看自己怎么设计。
译文：This effect looks simple, but the effect plus a reasonable and novel layout can also achieve a particularly beautiful module. The effect of this module is that the mouse passes the picture mask to display another picture. If the mouse is designed to be a PNG transparent map or a transparent color block, it can be generated on the page. It is a mask effect. If another opaque picture is displayed, even if it is a face changing effect, the final effect depends on how you design it.
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