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並前往https://medium.com/@daniwhkim/how-do-i-get-set-top-position-of-elements-scrolltop-offsettop-pageyoffset-scrolly-help-275a7ada5569

My scrollTop value is not working? scrollTop, offsetTop ...

pageYOffset is a read-only window property that returns the number of pixels the document has been scrolled vertically. And scrollY is the exactly same ...

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查詢 「scrollY pageYOffset」的人也找了：

  1. pageYOffset
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  6. CSS scroll position
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  8. scrollX
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