web页面浮动回到顶部功能和浮动广告

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实现测试浮动回到顶部

法一：用js实现
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="BackToTopTwo.aspx.cs" Inherits="PracticeCollectionTwo.BackToTopTwo" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="jquery.js" type="text/javascript"></script>
<style type="text/css">
.backToTop
{
position: absolute;
width: 100px;
border: 1px #ccc solid;
height: 20px;
z-index: 2000;
background-color: #ccc;
white-space: pre-wrap;
left: 100%;
margin-left: -102px;
display: none;
} .backToTop a:visited, .backToTop a:active, .backToTop a:link,.backToTop a:hover
{
text-decoration: none;
font-size: 18px;
}
.backToTop
{
text-align: center;
padding: 5px;
}
</style>
</head>
<body>
<h2>
对联浮动广告</h2>
<div class="backToTop" id='backToTop'>
<a href="#">回到顶部</a>
</div>
<input type="button" id='openAbs' value='显示对联广告'>
<script type="text/javascript">
for (var i = 0; i < 100; i++) {
document.writeln(i+"<br/>");
}
</script>
<script type="text/javascript">
window.onload = function () { var absTop = function () {
if (!this.backToTop) return;
var top = ((document.body.scrollTop || document.documentElement.scrollTop) + window.screen.availHeight - 200) + "px";
this.backToTop.style.top = top;
}; var scrollEvent = (function () {
window.onscroll = function () {
absTop();
};
})(); $("#backToTop").show();
absTop();
};
</script>
</body>
</html>法二：用样式

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script src="jquery.js" type="text/javascript"></script>
<title></title>
<style type="text/css">
.backToTop
{
position: fixed;
width: 100px;
border: 1px #ccc solid;
height: 20px;
z-index: 2000;
background-color: #ccc;
top: 650px;
}
.backToTop a:visited, .backToTop a:active, .backToTop a:link,.backToTop a:hover
{
text-decoration: none;
font-size: 18px;
}
.backToTop
{
text-align: center;
padding: 5px;
}
</style>
</head>
<body>
<script type="text/javascript">
for (var i = 0; i < 100; i++) { document.writeln(i + "<br />"); }
</script>
<div class="backToTop" id='backToTop'>
<a href="#" >回到顶部</a>
</div>
<script type="text/javascript">
$("#backToTop").hide();
$(".backToTop").click(function () {
$(window).scrollTop(0);
}); $(window).scroll(function () {
if ($(window).scrollTop() < 100) {
$("#backToTop").hide(); }
else {
$("#backToTop").show();
}
});
</script>
</body>
</html>

实现测试浮动广告<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="BackToTop.aspx.cs" Inherits="PracticeCollectionTwo.BackToTop" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.coupletAds
{
position: absolute;
width: 100px;
border: 1px #ccc solid;
height: 20px;
z-index: 2000;
background-color: #ccc;
white-space: pre-wrap;
display: none;
}
#coupletAdsLeft
{
left: 5px;
}
#coupletAdsRight
{
left: 100%;
margin-left: -102px;
}
.coupletAds a:visited ,.coupletAds a:active,.coupletAds a:link{
text-decoration: none;
font-size: 18px; }
</style>
</head>
<body>
<h2>
对联浮动广告</h2> <div class="coupletAds" id='coupletAdsRight'><a href="#">回到顶部</a> </div>
<input type="button" id='openAbs' value='显示对联广告'>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<p>
测试浮动广告```````````</p>
<br>
<script type="text/javascript">
window.onload = function () {
//对联广告单击显示
document.getElementById("openAbs").onclick = function () {
var coupletAdsRight = null,
coupletAds = function (absRight) {
coupletAdsRight = absRight;
this.coupletAdsRight.style.display = "block";
absTop();
},
absTop = function () {//两个对联层的top位置
if (!this.coupletAdsRight) return;
//如果 document.body.scrollTop == 0 选则document.documentElement.scrollTop值，
var top = ((document.body.scrollTop || document.documentElement.scrollTop) + window.screen.availHeight - 200) + "px";
this.coupletAdsRight.style.top = top;
},
scrollEvent = (function () {//滚轴事件
window.onscroll = function () {
absTop(); //重新修正广告top
}
})();
coupletAds(document.getElementById("coupletAdsRight"));
}
};
</script>
</body>
</html>