这是在用户结束滚动时检测方向的最佳解决方案。

var currentScrollTop = 0 ;

$(window).bind('scroll', function () {     

    scrollTop = $(this).scrollTop();

    clearTimeout($.data(this, 'scrollTimer'));
    $.data(this, 'scrollTimer', setTimeout(function() {

        if(scrollTop > currentScrollTop){
            // downscroll code
            $('.mfb-component--bl').addClass('mfbHide');
        }else{
            // upscroll code
            $('.mfb-component--bl').removeClass('mfbHide');
        }
        currentScrollTop = scrollTop;

    }, 250));

});

You can use this as well $(document).ready(function(){ var currentscroll_position = $(window).scrollTop(); $(window).on('scroll', function(){ Get_page_scroll_direction(); }); function Get_page_scroll_direction(){ var running_scroll_position = $(window).scrollTop(); if(running_scroll_position > currentscroll_position) { $('.direction_value').text('Scrolling Down Scripts'); } else { $('.direction_value').text('Scrolling Up Scripts'); } currentscroll_position = running_scroll_position; } }); .direction_value{ position: fixed; height: 30px; background-color: #333; color: #fff; text-align: center; z-index: 99; left: 0; top: 0; width: 100%; } <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div class="direction_value"> </div> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p>

检查当前的scrollTop和之前的scrollTop

var lastScrollTop = 0;
$(window).scroll(function(event){
   var st = $(this).scrollTop();
   if (st > lastScrollTop){
       // downscroll code
   } else {
      // upscroll code
   }
   lastScrollTop = st;
});

这适用于所有pc或手机浏览器，扩展顶部的答案。可以构建一个更复杂的事件对象窗口["scroll_evt"]，然后在handleScroll()函数中调用它。如果经过了一定的延迟或传递了一定的增量以消除一些不需要的触发器，则该函数将触发2个并发条件。

window["scroll_evt"]={"delta":0,"delay":0,"direction":0,"time":Date.now(),"pos":$(window).scrollTop(),"min_delta":120,"min_delay":10};
$(window).scroll(function() {

    var currentScroll = $(this).scrollTop();
    var currentTime = Date.now();
    var boolRun=(window["scroll_evt"]["min_delay"]>0)?(Math.abs(currentTime - window["scroll_evt"]["time"])>window["scroll_evt"]["min_delay"]):false;
    boolRun = boolRun && ((window["scroll_evt"]["min_delta"]>0)?(Math.abs(currentScroll - window["scroll_evt"]["pos"])>window["scroll_evt"]["min_delta"]):false);
    if(boolRun){
        window["scroll_evt"]["delta"] = currentScroll - window["scroll_evt"]["pos"];
        window["scroll_evt"]["direction"] = window["scroll_evt"]["delta"]>0?'down':'up';
        window["scroll_evt"]["delay"] =currentTime - window["scroll_evt"]["time"];//in milisecs!!!
        window["scroll_evt"]["pos"] = currentScroll;
        window["scroll_evt"]["time"] = currentTime;
        handleScroll();
    }
});


function handleScroll(){
    event.stopPropagation();
    //alert(window["scroll_evt"]["direction"]);
    console.log(window["scroll_evt"]);
}

为什么没有人使用滚动的jQuery返回的事件对象?

$window.on('scroll', function (event) {
    console.group('Scroll');
    console.info('Scroll event:', event);
    console.info('Position:', this.pageYOffset);
    console.info('Direction:', event.originalEvent.dir); // Here is the direction
    console.groupEnd();
});

我使用铬，我没有检查其他浏览器，如果他们有dir属性。

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