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canvas打造QQ空间低俗广告
source link: https://juejin.im/post/5addee8b6fb9a07ab97919b6
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在QQ空间中，我们最近经常可以看到某州学院的广告，当你滑下去时，会有一个圆形蒙版出现，并且会随着手指的滑动而变大或者变小。依赖技术这里的主要实现是利用canvas的2D绘图能力，会主要讲解drawImage与clip两个API的作用与原理。效果实现过程canv
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