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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 ...

I've carelessly asked for the scrollTop position of an element and it would always return 0 . In this case, I have to use element.offsetTop — ...

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