Each time a timetick event occurs in FadeIn state, the handleEvent method will call a function that increases the opacity of the tooltip slightly.
每当在 FadeIn 状态下发生 timetick 事件时，handleEvent 方法将调用一个函数，它略微增加工具提示的不透明度。
The function will return the current state, leaving the finite state machine in FadeIn state, until the tooltip's opacity reaches the maximum opacity parameter.
这个函数将返回当前状态，让有限状态机保持在FadeIn状态，直到工具提示的不透明度到达最大不透明度参数。
Perhaps I need to reload the page in between the fadeIn and fadeOut?
也许我需要重新加载页面之间渐明渐隐？
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