var middleHeight = $(document).scrollTop() + $(window).height() / 2.0;
Yes, you can use $(window).height() for the window height and $(document).scrollTop() (space between document start and current scroll height) for calculating the middle position of the screen.
var middleHeight = $(document).scrollTop() + $(window).height() / 2.0;
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是的，您可以使用 $(window).height() 作为窗口高度，使用 $(document).scrollTop() （文档开始和当前滚动高度之间的空间）来计算屏幕的中间位置。
Yes, you can use $(window).height() for the window height and $(document).scrollTop() (space between document start and current scroll height) for calculating the middle position of the screen.