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並前往https://stackoverflow.com/questions/50846913/why-are-we-supposed-to-prefer-document-visibilitystate-to-document-hidden

Why are we supposed to prefer document.visibilityState to ...

If steps to determine the visibility state return visible , then return false . 2. Otherwise, return true . Note. Support for hidden attribute ...

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查詢 「visibilityState」的人也找了：

  1. Visibilitychange
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  6. Pageshow
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  8. Pageshow event
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