如何使div跟随jQuery平滑滚动？

问题描述：

在我的容器中有节/框，但是当其他框都不可见时，这些框中的最后一个框应该跟随滚动。

In my container there are sections/boxes, but the last one of these boxes should follow scrolling when none of the other boxes are visible.

因此，当用户向下滚动时，他会看到一个正常的侧边栏，但是当用户向下滚动时，侧边栏将结束，但最后一个框将出现在屏幕顶部。我在不同类型的网站上看到过很多。

So, when user scrolls down, he sees a normal sidebar, but when user has went down enough, sidebar ends but the last box starts to follow on the top of the screen. I have seen this a lot on different kind of sites.

我目前的代码：

$(window).scroll(function(){
    $.each($('.follow-scroll'),function(){
        var eloffset = $(this).offset();
        var windowpos = $(window).scrollTop();
        if(windowpos<eloffset.top) {
            var finaldestination = 0;
        } else {
            var finaldestination = windowpos;
        }
        $(this).stop().animate({'top':finaldestination},200);
    });
});

答

由于这个问题引起了很多关注，在投票最多的答案中链接的教程似乎处于脱机状态，我花了一些时间清理此脚本。

Since this question is getting a lot of views and the tutorial linked in the most voted answer appears to be offline, I took the time to clean up this script.

在此处实时查看： JSFiddle

See it live here: JSFiddle

JavaScript：

JavaScript:

(function($) {
    var element = $('.follow-scroll'),
        originalY = element.offset().top;

    // Space between element and top of screen (when scrolling)
    var topMargin = 20;

    // Should probably be set in CSS; but here just for emphasis
    element.css('position', 'relative');

    $(window).on('scroll', function(event) {
        var scrollTop = $(window).scrollTop();

        element.stop(false, false).animate({
            top: scrollTop < originalY
                    ? 0
                    : scrollTop - originalY + topMargin
        }, 300);
    });
})(jQuery);

如何使div跟随jQuery平滑滚动？

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