用canvas API中ImageData相关方法,可以对图片上像素点的颜色进行控制,简单写了个demo [https://jsrun.net/uM5Kp/edit](https://link.segmentfault.com/?enc=t%2FsKrXfZN8hkgyv2GyvNnw%3D%3D.UWn%2FSxA6x883ROBXGuzrL4oeWFDFpznn38Sm7LMA9Oo%3D)
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