示例应用于 此事件在移动鼠标时发生。
When that click comes, you then want to install the mousemove and mouseup handlers.
当单击发生时，就需要安装 mousemove 和 mouseup 处理程序。
When the cursor then moves, any browser will generate a mousemove or mouseout event in Inactive state.
然后，当鼠标移动时，任何浏览器都会在 Inactive 状态下生成 mousemove 或 mouseout 事件。
In the design phase, you did not anticipate that mousemove or mouseout events would occur in Inactive state.
在设计阶段，没有预料到在Inactive状态下会出现mousemove或mouseout事件。
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