0 

$(window).scroll(function(){
    $("#theFixed").css("bottom",Math.max(0,250-$(this).scrollTop()));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<div id="theFixed" style="position:fixed;top:250px;background-color:red">SOMETHING</div>

STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>

...几乎可以工作，但是滚动更改的高度，theFixed我该如何解决？

编辑：也许我不清楚，我不需要将内容固定在“窗口”或外部容器的底部，我可以使用 CSS。

4

1 回答 1

1

height您可以使用 CSS属性显式设置所需的高度：

$(window).scroll(function() {
  $("#theFixed").css("bottom", Math.max(0, 250 - $(this).scrollTop()));
});
#theFixed {
  height: 20px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<div id="theFixed" style="position:fixed;top:250px;background-color:red">SOMETHING</div>

STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
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<BR>STUFF
<BR>STUFF
<BR>STUFF
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<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>

此外，与您的问题无关，但作为一般建议：当您为事件等注册事件侦听器时scroll，resize您通常还希望消除事件处理程序的执行，以便 UI 保持对其他类型事件的响应。

更多关于事件去抖动的信息。

于 2013-01-16T14:58:40.497 回答