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canvas 画笔的颜色透明度如何实现？

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  •   moohng · Feb 14, 2022 · 911 views
    This topic created in 1563 days ago, the information mentioned may be changed or developed.

    如下图所示，每一条笔迹刚开始的时候颜色深一些，后面逐渐变浅。好像颜色在不停的叠加，我用的是 globalAlpha 全局透明度，有没有什么解决方法？

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    透明度颜色canvas画笔
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