保持超级简单:

jQuery事件监听器

$(window).on('wheel', function(){
  whichDirection(event);
});

香草JavaScript事件监听器

if(window.addEventListener){
  addEventListener('wheel', whichDirection, false);
} else if (window.attachEvent) {
  attachEvent('wheel', whichDirection, false);
}

功能不变:

function whichDirection(event){
  console.log(event + ' WheelEvent has all kinds of good stuff to work with');
  var scrollDirection = event.deltaY;
  if(scrollDirection === 1){
    console.log('meet me at the club, going down', scrollDirection);
  } else if(scrollDirection === -1) {
    console.log('Going up, on a tuesday', scrollDirection);
  }
}

我在这里写了一篇更深入的文章 ​​​​​​​

保持超级简单:

jQuery事件监听器

$(window).on('wheel', function(){
  whichDirection(event);
});

香草JavaScript事件监听器

if(window.addEventListener){
  addEventListener('wheel', whichDirection, false);
} else if (window.attachEvent) {
  attachEvent('wheel', whichDirection, false);
}

功能不变:

function whichDirection(event){
  console.log(event + ' WheelEvent has all kinds of good stuff to work with');
  var scrollDirection = event.deltaY;
  if(scrollDirection === 1){
    console.log('meet me at the club, going down', scrollDirection);
  } else if(scrollDirection === -1) {
    console.log('Going up, on a tuesday', scrollDirection);
  }
}

我在这里写了一篇更深入的文章 ​​​​​​​

你可以确定鼠标的方向。

$(window).on('mousewheel DOMMouseScroll', function (e) {
    var delta = e.originalEvent.wheelDelta ? 
                   e.originalEvent.wheelDelta : -e.originalEvent.detail;

    if (delta >= 0) {
        console.log('scroll up');
    } else {
        console.log('scroll down');
    }
});

存储之前的滚动位置，然后查看新的滚动位置是否大于或小于该位置。

这里有一个避免任何全局变量的方法(在这里可以找到):

(function () {
    var previousScroll = 0;

    $(window).scroll(function(){
       var currentScroll = $(this).scrollTop();
       if (currentScroll > previousScroll){
           alert('down');
       } else {
          alert('up');
       }
       previousScroll = currentScroll;
    });
}()); //run this anonymous function immediately

为了忽略页面顶部和底部的任何snap / momentum / bounce back，这里是Josiah接受的答案的修改版本:

var prevScrollTop = 0;
$(window).scroll(function(event){

    var scrollTop = $(this).scrollTop();

    if ( scrollTop < 0 ) {
        scrollTop = 0;
    }
    if ( scrollTop > $('body').height() - $(window).height() ) {
        scrollTop = $('body').height() - $(window).height();
    }

    if (scrollTop >= prevScrollTop && scrollTop) {
        // scrolling down
    } else {
        // scrolling up
    }

    prevScrollTop = scrollTop;
});

我有弹性滚动的问题(滚动弹跳，橡皮筋)。 如果接近页面顶部，忽略下滚动事件对我来说是有效的。

var position = $(window).scrollTop();
$(window).scroll(function () {
    var scroll = $(window).scrollTop();
    var downScroll = scroll > position;
    var closeToTop = -120 < scroll && scroll < 120;
    if (downScroll && !closeToTop) {
        // scrolled down and not to close to top (to avoid Ipad elastic scroll-problems)
        $('.top-container').slideUp('fast');
        $('.main-header').addClass('padding-top');
    } else {
        // scrolled up
        $('.top-container').slideDown('fast');
        $('.main-header').removeClass('padding-top');
    }
    position = scroll;
});