@
arden 记录手指在屏幕上的触摸点、时间点、画笔设置，这样就行了。回放的时候，时间点可以调节一下，让回放速度显得快一些。浏览器显示是用 Canvas 绘制的。。
下面是你给的链接里那个签名的 JSON 数据：
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