jquery滚动到页面底部问题？

源码:

$(window).scroll(function () { var scrollTop = $(this).scrollTop() var scrollHei优艾设计网_设计百科ght = $(document).height() var windowHeight = $(this).height()console.log(`scrollTop: ${scrollTop}`) console.log(`windowHeight: ${windowHeight}`) console.log(`scrollHeight: ${scrollHeight}`)})

为啥当页面滚动到底部时, scrollTop + windowHeight 的总大小 [大于] scrollHeight , 不是应该相等才对吗?

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