摘自：JQuery侧边栏滚动
$(function() {
//取得所要滚动的侧边栏
var $sidebar = $("#text-3"),
//取得窗口对象
$window = $(window),
//获取元素在当前视口的相对偏移。
//主要是为获得top值，以便计算是不需要偏移
offset = $sidebar.offset(),
//定义默认的一个间距值，即滚动后距窗口边缘的距离
topPadding = 15;
//添加窗口滚动事件的方法
$window.scroll(function() {
//获取window相对滚动条顶部的偏移，然后与元素的top进行比较
//如果元素的top值小的话，说明元素需要移动！
if ($window.scrollTop() > offset.top) {
$sidebar.stop().animate( //先停止所有动画，然后改变元素的margin-top值
//先减去top值，然后加上自定义的边距。
{marginTop: $window.scrollTop() - offset.top + topPadding}
);
} else { //否则，先停止动画，并将margin-top置0，即不需要下移了
$sidebar.stop().animate({
marginTop: 0
});
}
});
});
PS：发现类似的代码都存在一个小bug，如果侧边栏的高度大于浏览器的高度（即浏览器不能完全显示侧边栏的话），那么滚动条是一直存在的，那么就可以一直一直的滚下去的…… 当然既然显示不全就应该可以滚下去，但这样的情况太特殊了呢。（我认为应该计算，滚动到一定的长度后就无须再滚了，因为下面没有其它的内容了，除了侧边栏未显示的内容而已）
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