我的解决方案有点啰嗦，但它处理变量定位从左边缘居中布局。

// Ensurs that a element (usually a div) stays on the screen
//   aElementToStick   = The jQuery selector for the element to keep visible
global.makeSticky = function (aElementToStick) {
    var $elementToStick = $(aElementToStick);
    var top = $elementToStick.offset().top;
    var origPosition = $elementToStick.css('position');

    function positionFloater(a$Win) {
        // Set the original position to allow the browser to adjust the horizontal position
        $elementToStick.css('position', origPosition);

        // Test how far down the page is scrolled
        var scrollTop = a$Win.scrollTop();
        // If the page is scrolled passed the top of the element make it stick to the top of the screen
        if (top < scrollTop) {
            // Get the horizontal position
            var left = $elementToStick.offset().left;
            // Set the positioning as fixed to hold it's position
            $elementToStick.css('position', 'fixed');
            // Reuse the horizontal positioning
            $elementToStick.css('left', left);
            // Hold the element at the top of the screen
            $elementToStick.css('top', 0);
        }
    }

    // Perform initial positioning
    positionFloater($(window));

    // Reposition when the window resizes
    $(window).resize(function (e) {
        positionFloater($(this));
    });

    // Reposition when the window scrolls
    $(window).scroll(function (e) {
        positionFloater($(this));
    });
};

这就是我用jquery做的。这都是根据堆栈溢出的各种答案拼凑起来的。这个解决方案缓存选择器以获得更快的性能，并且还解决了当粘性div变得粘性时的“跳跃”问题。

在jsfiddle: http://jsfiddle.net/HQS8s/上查看它

CSS:

.stick {
    position: fixed;
    top: 0;
}

JS:

$(document).ready(function() {
    // Cache selectors for faster performance.
    var $window = $(window),
        $mainMenuBar = $('#mainMenuBar'),
        $mainMenuBarAnchor = $('#mainMenuBarAnchor');

    // Run this on scroll events.
    $window.scroll(function() {
        var window_top = $window.scrollTop();
        var div_top = $mainMenuBarAnchor.offset().top;
        if (window_top > div_top) {
            // Make the div sticky.
            $mainMenuBar.addClass('stick');
            $mainMenuBarAnchor.height($mainMenuBar.height());
        }
        else {
            // Unstick the div.
            $mainMenuBar.removeClass('stick');
            $mainMenuBarAnchor.height(0);
        }
    });
});

以下是Josh Lee的回答的扩展版本。如果你想让div在侧边栏的右边，并浮动在一个范围内(即，你需要指定顶部和底部锚位置)。它还修复了一个bug，当你在移动设备上查看这个(你需要检查左滚动位置，否则div将移出屏幕)。

function moveScroller() {
    var move = function() {
        var st = $(window).scrollTop();
        var sl = $(window).scrollLeft();
        var ot = $("#scroller-anchor-top").offset().top;
        var ol = $("#scroller-anchor-top").offset().left;
        var bt = $("#scroller-anchor-bottom").offset().top;
        var s = $("#scroller");
        if(st > ot) {
            if (st < bt - 280) //280px is the approx. height for the sticky div
            {
                s.css({
                    position: "fixed",
                    top: "0px",
                    left: ol-sl
                }); 
            }
            else
            {
                s.css({
                    position: "fixed",
                    top: bt-st-280,
                    left: ol-sl
                }); 
            }
        } else {
            s.css({
                position: "relative",
                top: "",
                left: ""
            });

        }
    };
    $(window).scroll(move);
    move();
}

为回答这个问题提供的信息可能对你有帮助，埃文:

检查滚动后元素是否可见

基本上，只有在验证document.body.scrollTop值等于或大于元素的顶部之后，才希望修改元素的样式，将其设置为fixed。

你可以添加额外的3行，这样当用户滚动回顶部时，div将保持在原来的位置:

代码如下:

if ($(this).scrollTop() < 200 && $el.css('position') == 'fixed'){
    $('.fixedElement').css({'position': 'relative', 'top': '200px'});
}

我的解决方案有点啰嗦，但它处理变量定位从左边缘居中布局。

// Ensurs that a element (usually a div) stays on the screen
//   aElementToStick   = The jQuery selector for the element to keep visible
global.makeSticky = function (aElementToStick) {
    var $elementToStick = $(aElementToStick);
    var top = $elementToStick.offset().top;
    var origPosition = $elementToStick.css('position');

    function positionFloater(a$Win) {
        // Set the original position to allow the browser to adjust the horizontal position
        $elementToStick.css('position', origPosition);

        // Test how far down the page is scrolled
        var scrollTop = a$Win.scrollTop();
        // If the page is scrolled passed the top of the element make it stick to the top of the screen
        if (top < scrollTop) {
            // Get the horizontal position
            var left = $elementToStick.offset().left;
            // Set the positioning as fixed to hold it's position
            $elementToStick.css('position', 'fixed');
            // Reuse the horizontal positioning
            $elementToStick.css('left', left);
            // Hold the element at the top of the screen
            $elementToStick.css('top', 0);
        }
    }

    // Perform initial positioning
    positionFloater($(window));

    // Reposition when the window resizes
    $(window).resize(function (e) {
        positionFloater($(this));
    });

    // Reposition when the window scrolls
    $(window).scroll(function (e) {
        positionFloater($(this));
    });
};