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var lastScrollTop = 0;
$(window).scroll(function(event){
var st = $(this).scrollTop() || window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
출처: https://seunggabi.tistory.com/entry/JS-Browser-scrollTop [배우기를 멈추는 사람은 20세건 80세건 늙은 것이다.]
if (st > lastScrollTop){
// downscroll code
} else {
// upscroll code
}
lastScrollTop = st;
});
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