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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The final two methods of the Event module, mouseover(fn) and mouseout(fn), are quite common in most Web sites today.

Event 模块的最后两个方法 mouseover(fn) 和 mouseout(fn) 目前在很多 Web 站点上都很常见。

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You'll notice that this time you simply define a single function that is called by both the mouseover and mouseout events.

您会注意到，这次只定义了一个函数供mouseover和mouseout事件调用。

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