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並前往https://pretagteam.com/question/why-is-windowpageyoffset-always-0-and-how-can-i-get-a-value-to-check-if-the-page-has-being-scrolled-down-or-up

Why is window.pageYOffset always 0? and how can I get a ...

scrollY, see that article for additional details on this value and its use.,The corresponding pageXOffset property, which returns the number of ...

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