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並前往https://docs.w3cub.com/dom/document/visibilitystate

document.visibilityState - DOM - W3cubDocs

document.visibilityState · 'visible': The page content may be at least partially visible. · 'hidden': The page content is not visible to the user. · 'prerender' ...

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查詢 「visibilityState」的人也找了：

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