let scrollY = window.scrollY; // 初始值
$(window).on('scroll', funcation() {
let currentY = window.scrollY;
if(currentY < = scroollY) { // 向下滑动
$(element).hide()
} else { // 向上
$(element).show()
}
(currentY === 0) && $(element).hide()
scroll = currentY
})
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