基于JavaScript实现div层跟随滚动条滑动

前端技术 2023/09/09 JavaScript

在一个页面放2个悬浮框，悬浮框随页面的上下滚动有上下波动的效果，最终固定在同一位置

效果展示如下所示：

代码如下：

<!DOCTYPE html>
<html lang=\"en\">
<head>
<meta charset=\"UTF-8\">
<title>JavScript页面悬浮框- 何问起</title><base target=\"_blank\" />
<style>
body {
height: 2000px;
}
#div1 {
width: 100px;
height: 150px;
background: red;
position: absolute;
right: 0;
top:200px;
}
#div2 {
width: 200px;
height: 200px;
background: green;
position: absolute;
left: 0;
top: 200px;
}a{color:white}
</style>
</head>
<body>
<div id=\"div1\"><a href=\"http://hovertree.com\">何问起</a> <a href=\"http://hovertree.com/texiao/\">特效</a></div>
<div id=\"div2\"><a href=\"http://hovertree.com/h/bjaf/mbrpxe4o.htm\">原文</a>
<a href=\"http://hovertree.com/texiao/jsstudy/1/\">效果</a>
</div>
<div id=\"hovertree\" style=\"position:fixed;top:100px;left:40%;z-index:99;height:100px;width:100px;background-color:silver\"></div>
<div>在一个页面放2个悬浮框，悬浮框随页面的上下滚动有上下波动的效果，最终固定在同一位置</div>
<script>
var h_div1 = document.getElementById(\'div1\'), h_div2 = document.getElementById(\'div2\');
var h_hvttop = 200;
window.onscroll = function () {
HoverTreeMove(h_div1, h_hvttop)
HoverTreeMove(h_div2, h_hvttop)
//显示信息
var h_scrollTop = document.documentElement.scrollTop || document.body.scrollTop;//滚动的距离
var h_hovertree = document.getElementById(\'hovertree\'); 
h_hovertree.innerHTML = h_div1.offsetTop + \" hovertree<br /> \" + h_scrollTop + \"<br />\" + h_div1.style.top;
};
function HoverTreeMove(obj,top)
{
var h_scrollTop = document.documentElement.scrollTop || document.body.scrollTop;//滚动的距离
var h_buchang = 20;
if (obj.offsetTop < h_scrollTop + top - h_buchang)
{
obj.style.top = obj.offsetTop + h_buchang + \"px\";
setTimeout(function () { HoverTreeMove(obj, top); }, 80);
}
else if (obj.offsetTop > h_scrollTop + top + h_buchang)
{
obj.style.top = (obj.offsetTop - h_buchang) + \"px\";
setTimeout(function () { HoverTreeMove(obj, top); }, 80);
}
else {
obj.style.top = h_scrollTop + top + \"px\";
}
}
HoverTreeMove(h_div1, 200)
HoverTreeMove(h_div2, 200)
</script>
</body>
</html>

下面给大家分享一段代码页面顶端固定div，不随滚动条移动，提示浏览器信息

例子1：

<html>
<head>
<style type=\"text/css\">
#topNavWrapper {
height: 29px;
margin: 0px auto;
min-width:1000px;
z-index:100;
_position: relative ;
_top:0px; 
}
#topNav 
{
width:100%;
display: block;
z-index: 100;
overflow: visible;
position: fixed;
top: 0px; 
_position: absolute;
_top: expression(documentElement.scrollTop-5 + \"px\");
background-color:#EBEBEB;
border-bottom-style:solid;
border-bottom-width:1px;
border-bottom-color:#D0D0D0;
height: 28px;
min-width:1000px;
}
#top
{
margin: 0px auto;
width:1000px;
position:relative;
} 
.left
{
left:5px;
top:6px;
width:200px;
position:absolute;
}
.leftlx
{
left:205px;
top:6px;
width:300px;
position:absolute;
}
.right
{
left:830px;
top:6px;
width:170px;
position:absolute;
}
#top a
{
text-decoration: none;
color:#747474;
}
#top a:hover
{
color: blue;
text-decoration: underline;
}
</style>
</head>
<body>
<div id=\"topNavWrapper\">
<div id=\"topNav\">
<div id=\"top\">
<div class=\"left\">您好!欢迎来到....^ ^</div><div class=\"leftlx\"><a href=\"about.aspx?id=1\">[联系我们]</a>  客户服务热线: 400-699-1111</div>
<div class=\"right\">
<table cellpadding=\"0\" cellspacing=\"0\"><tr><td><a href=\"#\">简体中文</a></td><td>|</td><td><a href=\"big5.html\">繁体中文</a></td>
<td>|</td><td><a onclick=\'window.external.addFavorite(\"http://www.xxxx.com\",\"xxxx\")\' href=\"#\">收藏本站</a></td></tr></table>
</div>
</div>
</div>
</div>
</body>
</html>

例子2：

<style type=\"text/css\">
{
margin: 0px;
padding: 0px;
}
body {
background-attachment: fixed; /* prevent screen flash in IE6 */
}
#topNavWrapper {
width: 100%;
text-align: left;
height: 28px;
margin: 0px auto;
z-index:100;
_position: relative ;
_top:0px;
}
#topNav {
width: 100%;
float: left;
display: block;
z-index: 100;
overflow: visible;
position: fixed;
top: 0px; /* position fixed for IE6 */
_position: absolute;
_top: expression(documentElement.scrollTop + \"px\");
height: 28px;
}
</style>

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