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                >[info] 相關文章 * [HTML元素的height、offsetHeight、clientHeight、scrollTop等梳理](https://segmentfault.com/a/1190000037426695); * [Javascript零碎之各種寬高屬性及應用](https://segmentfault.com/a/1190000019608199) ; * [JS獲取屏幕、瀏覽器、頁面的寬度和高度](https://segmentfault.com/a/1190000010443608); * [# 兩張圖詳解解元素位置寬度的屬性(offsetHeight/ClientHeight/ScrollHeight/getBoundingClientRect)](https://cloud.tencent.com/developer/article/1499096) >[info] 頁面文檔滾動條高度 ``` const sTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop; ``` 或者 ``` const sTop = document.scrollingElement.scrollTop; ``` **說明:** * html文檔在有DOCTYPE申明的時候document.body.scrollTop = 0; 沒有DOCTYPE申明的時候,document.documentElement.scrollTop = 0
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