添加实时获取鼠标轨迹的范例代码

[poerlang]

如果需要获取鼠标的 实时轨迹 （实时的Offset），应该关注一下 DropTargetMonitor 而不是 DragSourceMonitor， 比如，你可以在 useDrop 的回调 hover: (item, monitor) => {...} 的参数中获取 DropTargetMonitor：

<--范例代码-->

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[hcg1023]

@poerlang 关于这个注意的内容以及示例代码，放到常见问题模块会好一些吧，并且在hover中赋值也不是必要的，更多的是他需要知道在hover中能做这个事情，如果在hover外部需要offset等信息，应该是通过collect暴露属性

[poerlang]

了解了解