It seems that mouseup events are only fired when they are not in conjunction with a mousemove. In other words, push down on the left mouse button and let go, and mouseup is fired. But if you drag across the image and then let go, no mouseup is fired. Here is an example that shows this behavior:It seems that mouseup events are only fired whe
阅读背景：
一旦mousemove完成，如何让mouseup启动
来源：互联网
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