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並前往https://www.developerdrive.com/how-to-use-the-visibility-api/

How to use the Visibility API - Developer Drive

visibilityState : This will tell you if your website is visible, ... Next, we need to listen for changes in the visibility state, which we do with a listener ...

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查詢 「visibilityState」的人也找了：

  1. Visibilitychange
    2.
  2. Page Visibility API
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  3. Page Lifecycle API
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  4. onVisibilityChange
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  5. Pagehide
    6.
  6. Pageshow
    7.
  7. Document hasFocus
    8.
  8. Pageshow event
    9.