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探究 canvas 绘图中撤销（undo）功能的实现方式
source link: https://juejin.im/post/5ae5ccfb6fb9a07aa34a06f6
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最近在做网页版图片处理相关的项目，也算是初入了 canvas 的坑。项目需求中有一个给图片添加水印的功能。我们知道，在浏览器端实现图片添加水印功能，通常的做法就是使用 canvas 的 drawImage 方法。对于普通的合成（比如一张底图和一张 PNG 水印
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