📅  最后修改于: 2022-03-11 15:03:58.208000             🧑  作者: Mango
let scrollDirection = '';
let scrollTopPosition = 0;
$(window).on('scroll', function() {
if(scrollTopPosition > $(window).scrollTop()) {
scrollDirection = 'to-top';
} else {
scrollDirection = 'to-bottom';
}
scrollTopPosition = $(window).scrollTop();
});
console.log(scrollDirection);