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Introducing the JavaScript Window Object — VisibilityState ...

The visibilityState property is a read-only property that returns the visibility status of the document object in which context this element ...

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查詢 「visibilityState」的人也找了：

  1. Visibilitychange
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  2. Page Visibility API
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  3. Page Lifecycle API
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  4. onVisibilityChange
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  5. Pagehide
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  6. Pageshow
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  7. Document hasFocus
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  8. Pageshow event
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