Is there a solution for adding a class to the element in view when scrolling, and removing when out of view? This needs to work for a scrollable div. I have found a few solutions so far but they only seem to work for body... not a scrollable div.Is there a solution for adding a class to the e
阅读背景：
在滚动到视图时向元素添加类(可滚动div)
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