function scrolls(){
var advobj=document.getElementById("adv")
advobj.style.top=100+document.documentElement.scrollTop+"px"
}
window.onscroll=scrolls
function winclose(){
var advobj=document.getElementById("adv")
advobj.style.display="none"
}
</script>
<body>
<!--随滚动条移动的浮动窗口############################-->
<div id="adv" style="">
<img src="图片路径"/>
<div id="close" onclick="winclose()">关闭</div>
</div>
<div id="header"><iframe src="header.html" height="155px" width="960px" frameborder="0"scrolling="no"></iframe></div>
</body>
JQuery实现将Div浮动到网页最上层。可以通过Css的z-index属性来进行设置
具体代码：
1
$(".divClass").attr("z-index",999)
原理：
通过JQuery给指定的div增加属性'z-index'为'999'，将指定div的层次拉到最高，这个所谓的999并不一定是999这个数字，只需要是你页面z-index的最大值就是可以的。
第一种方法:Html代码
<html>
<head>
<title>浮动窗口</title>
<link type="text/css" rel="stylesheet" href="css/overflow.css" />
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/overflow.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var b = $("#b")
var overFlow = $("#over")
b.click(function(){
overFlow.fadeIn()
$("#mask").css("background","#111")
$("#mask").css("opacity","0.8")
})
$("#close").click(function(){
overFlow.fadeOut()
$("#mask").css("background","#fff")
$("#mask").css("opacity","1")
})
drag($("#over"),$("#title"))
})
</script>
</head>
<body>
<div id="over">
<div id="title"><span id="t">这只是一个演示标题</span><span id="close">[ x ]</span></div>
<div id="content">
When a container object, such as a div, has mouse capture, events originating on objects within that container are fired by the div, unless the bContainerCapture parameter of the setCapture method is set to false. Passing the value false causes the container to no longer capture all document events. Instead, objects within that container still fire events, and those events also bubble as expected.<br/>
---This is edited by Alp.
</div>
</div>
<div id="mask"><a id="b" href="#">click</a></div>
</body>
</html>
Js代码
function drag(overFlow,title){
title.onmousedown = function(evt){
var doc = document
var evt = evt || window.event
var x = evt.offsetX?evt.offsetX:evt.layerX
var y = evt.offsetY?evt.offsetY:evt.layerY
if(overFlow.setCapture){
overFlow.setCapture()
}else if(window.captureEvents){
window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP)
}
doc.onmousemove = function(evt){
evt = evt || window.event
var xPosition = evt.pageX || evt.clientX
var yPosition = evt.pageY || evt.clientY
var newX = xPosition - x
var newY = yPosition - y
overFlow.style.left = newX
overFlow.style.top = newY
}
doc.onmouseup = function(){
if(overFlow.releaseCapture){
overFlow.releaseCapture()
}else if(window.captureEvents){
window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP)
}
doc.onmousemove=null
doc.onmouseup=null
}
}
}
css代码
#over{
position: absolute
left: 300px
top: 200px
border: 1px solid black
display: none
background: #cccccc
cursor: default
width: 300px
z-index: 10
opacity: 1
}
#title{
border: 1px solid #1840C4
background: #95B4DC
padding: 2px
font-size:12px
cursor: default
}
#close{
cursor: pointer
margin-right: 1px
overflow: hidden
}
#content{
border: 1px solid #C2D560
background: #EFF4D7
}
#t{
margin-right:145px
}
#mask{
z-index: 1
background: #fff
width: 1024px
height: 800px
}
#b{
position: absolute
left: 200px
top: 100px
}
body{
padding: 0px
margin: 0px
}
#over{
background: transparent
}
第二种方法:
消息框遮罩层:<iframe id="show_upload_iframe" frameborder=0 scrolling="no" style="display:noneposition:absolute"></iframe><div id="show_upload">nothing...</div>'
页面加载loading中:<div id="body_loading" onClick="loaded()"><img src="__PUBLIC__/images/body_load.gif"></div>
关闭浮动窗口:<a href="javascript:hideupload()">关闭窗口建议用小图片</a>
打开浮动窗口:<a href="javascript:showupload('admin.php')">打开浮动</a>
// 消息框loading
function loading(){
var o = $('#body_loading')
o.css("left",(($(document).width())/2-(parseInt(o.width())/2))+"px")
o.css("top",(($(document).height()+$(document).scrollTop())/2-(parseInt(o.height())/2))+"px")
o.fadeIn("fast")
}
// 消息框消失
function loaded(){
var o = $('#body_loading')
o.fadeOut("fast")
}
// 隐藏浮动窗口
function hideupload(){
$('#show_upload').hide()
$('#show_upload_iframe').hide()
}
// 弹出浮动窗口
function showupload(ajaxurl){
loading()
var o=$('#show_upload')
var f=$('#show_upload_iframe')
var top = 200
$.ajax({
url: ajaxurl,
//cache: false,
success: function(res){
loaded()
o.html(res)
o.css("left",(($(document).width())/2-(parseInt(o.width())/2))+"px")
if($(document).scrollTop()>200){
top = ($(document).height()+$(document).scrollTop())/2-(parseInt(o.height())/2)
}
o.css("top",top+"px")
f.css({'width':o.width(),'height':o.height(),'left':o.css('left'),'top':o.css('top')})
f.show()
o.show()
}
})
}
