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学习 canvas 的 globalCompositeOperation 做出的神奇效果
source link: https://juejin.im/post/5b87de766fb9a01a175dce1e
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说明 最早知道 canvas 的 globalCompositeOperation 属性，是在需要实现一个刮刮卡效果的时候，当时也就是网上找到刮刮卡的效果赶紧完成任务就完了，这次又学习一次，希望能加深理解吧。 先来看下 canvas 的 globalComp
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