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因此,我的代码设置为在向下滚动时使框淡出(这是有效的),但是当我告诉它在向上滚动时淡入时,它就不起作用了。 if ($(this).scrollTop() > 200) { //use `this`, not `document` }$(window).scroll(function() {
if ($(this).scrollTop() <