你可以这样做，而不必跟踪之前的滚动顶部，因为所有其他的例子都要求:

$(window).bind('mousewheel', function(event) {
    if (event.originalEvent.wheelDelta >= 0) {
        console.log('Scroll up');
    }
    else {
        console.log('Scroll down');
    }
});

我不是这方面的专家，所以请随意进一步研究，但当您使用$(element)时。滚动，被监听的事件是一个'滚动'事件。

但是如果您使用bind专门监听鼠标滚轮事件，则回调的事件参数的originalEvent属性包含不同的信息。其中一部分信息是wheelDelta。如果是正数，你就向上移动鼠标滚轮。如果是负的，鼠标滚轮就向下移动了。

我的猜测是鼠标滚轮事件将在鼠标滚轮转动时触发，即使页面没有滚动;在这种情况下，'scroll'事件可能不会被触发。如果需要，可以在回调的底部调用event. preventdefault()来阻止页面滚动，这样就可以将鼠标滚轮事件用于页面滚动之外的其他事情，比如某种类型的缩放功能。

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>

在元素的.data()中，您可以存储JSON和测试值来启动事件

{ top : 1,
   first_top_event: function(){ ...},
   second_top_event: function(){ ...},
   third_top_event: function(){ ...},
   scroll_down_event1: function(){ ...},
   scroll_down_event2: function(){ ...}
}

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');
    }
});

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。

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;
});