采用CSS进行网站布局特点非常整洁，使内容更加清晰，更容易让设计人员进行分离，不象表格布局充满各种各样的属性和数字，而且很多CSS文件通常是共用的，从而大大缩减页面代码，提高页面浏览速度，采用DIV+CSS代码进行网站制作对关键词排名优化也是有很多的好处。
DIV+CSS是实现WEB标准的主要技术手段之一，WEB标准不仅仅是HTML向XHTML的转换，更重要的是信息结构清晰、内容与表现相分离，而DIV+CSS技术能较好的实现这种思想。因此，我们看到的多数符合标准的页面都是采用DIV+CSS制作。
提倡用DIV+CSS布局来替代传统的Table布局。原因是TABLE布局将表现和内容混杂在一起，结构不清晰、内容不完整，不利于内容的重用。而且从语义上讲，W3C制定TABLE标签时候只是用它来做表格结构定义的，文档中如果有表格，那么就应该用TABLE。而排版、定位这些表现的东西应该由CSS 来控制。
使用Table布局，为了达到一定的视觉效果，不得不套用多个表格，而搜索引擎一般不抓取三层以上的表格嵌套，遇到多层 表格嵌套时，spider通常会跳过嵌套的内容或直接放弃整个页面。使用DIV+CSS布局，页面代码精简，而且表现和代码分离，使网站代码具备较强的语义结构，在方便维护更新的同时，还能获得更好的搜索引擎表现力。事情证明：各大搜索引擎蜘蛛/机器人更喜欢采用DIV+CSS布局的网站。
<html><head>
<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312">
<title>页面内的超级酷浮动窗口</title>
<style type='text/css'>
<!--
a:visited{text-decoration:nonecolor:slategray}
a:hover{text-decoration:underlinecolor:slategray}
a:link{text-decoration:nonecolor:slategray}
-->
</style>
<script language=JScript>
<!--
//可以打包为js文件
var x0=0,y0=0,x1=0,y1=0
var offx=6,offy=6
var moveable=false
var hover='orange',normal='slategray'//color
var index=10000//z-index
//开始拖动
function startDrag(obj)
{
if(event.button==1)
{
//锁定标题栏
obj.setCapture()
//定义对象
var win = obj.parentNode
var sha = win.nextSibling
//记录鼠标和层位置
x0 = event.clientX
y0 = event.clientY
x1 = parseInt(win.style.left)
y1 = parseInt(win.style.top)
//记录颜色
normal = obj.style.backgroundColor
//改变风格
obj.style.backgroundColor = hover
win.style.borderColor = hover
obj.nextSibling.style.color = hover
sha.style.left = x1 + offx
sha.style.top = y1 + offy
moveable = true
}
}
//拖动
function drag(obj)
{
if(moveable)
{
var win = obj.parentNode
var sha = win.nextSibling
win.style.left = x1 + event.clientX - x0
win.style.top = y1 + event.clientY - y0
sha.style.left = parseInt(win.style.left) + offx
sha.style.top = parseInt(win.style.top) + offy
}
}
//停止拖动
function stopDrag(obj)
{
if(moveable)
{
var win = obj.parentNode
var sha = win.nextSibling
var msg = obj.nextSibling
win.style.borderColor = normal
obj.style.backgroundColor = normal
msg.style.color = normal
sha.style.left = obj.parentNode.style.left
sha.style.top = obj.parentNode.style.top
obj.releaseCapture()
moveable = false
}
}
//获得焦点
function getFocus(obj)
{
if(obj.style.zIndex!=index)
{
index = index + 2
var idx = index
obj.style.zIndex=idx
obj.nextSibling.style.zIndex=idx-1
}
}
//最小化
function min(obj)
{
var win = obj.parentNode.parentNode
var sha = win.nextSibling
var tit = obj.parentNode
var msg = tit.nextSibling
var flg = msg.style.display=="none"
if(flg)
{
win.style.height = parseInt(msg.style.height) + parseInt(tit.style.height) + 2*2
sha.style.height = win.style.height
msg.style.display = "block"
obj.innerHTML = "0"
}
else
{
win.style.height = parseInt(tit.style.height) + 2*2
sha.style.height = win.style.height
obj.innerHTML = "2"
msg.style.display = "none"
}
}
//关闭
function cls(obj)
{
var win = obj.parentNode.parentNode
var sha = win.nextSibling
win.style.visibility = "hidden"
sha.style.visibility = "hidden"
}
//创建一个对象
function xWin(id,w,h,l,t,tit,msg)
{
index = index+2
this.id = id
this.width = w
this.height = h
this.left= l
this.top = t
this.zIndex = index
this.title = tit
this.message = msg
this.obj = null
this.bulid = bulid
this.bulid()
}
//初始化
function bulid()
{
var str = ""
+ "<div id=xMsg" + this.id + " "
+ "style='"
+ "z-index:" + this.zIndex + ""
+ "width:" + this.width + ""
+ "height:" + this.height + ""
+ "left:" + this.left + ""
+ "top:" + this.top + ""
+ "background-color:" + normal + ""
+ "color:" + normal + ""
+ "font-size:10px"
+ "font-family:Verdana"
+ "position:absolute"
+ "cursor:default"
+ "border:2px solid " + normal + ""
+ "' "
+ "onmousedown='getFocus(this)'>"
+ "<div "
+ "style='"
+ "background-color:" + normal + ""
+ "width:" + (this.width-2*2) + ""
+ "height:20"
+ "color:white"
+ "' "
+ "onmousedown='startDrag(this)' "
+ "onmouseup='stopDrag(this)' "
+ "onmousemove='drag(this)' "
+ "ondblclick='min(this.childNodes[1])'"
+ ">"
+ "<span style='width:" + (this.width-2*12-4) + "padding-left:3px'>" + this.title + "</span>"
+ "<span style='width:12border-width:0pxcolor:whitefont-family:webdings' onclick='min(this)'>0</span>"
+ "<span style='width:12border-width:0pxcolor:whitefont-family:webdings' onclick='cls(this)'>r</span>"
+ "</div>"
+ "<div style='"
+ "width:100%"
+ "height:" + (this.height-20-4) + ""
+ "background-color:white"
+ "line-height:14px"
+ "word-break:break-all"
+ "padding:3px"
+ "'>" + this.message + "</div>"
+ "</div>"
+ "<div style='"
+ "width:" + this.width + ""
+ "height:" + this.height + ""
+ "top:" + this.top + ""
+ "left:" + this.left + ""
+ "z-index:" + (this.zIndex-1) + ""
+ "position:absolute"
+ "background-color:black"
+ "filter:alpha(opacity=40)"
+ "'>by wildwind</div>"
document.body.insertAdjacentHTML("beforeEnd",str)
}
//-->
</script>
<script language='JScript'>
<!--
function initialize()
{
var a = new xWin("1",160,200,200,200,"Message","xWin <br>A Cool Pop Div Window<br>Version:1.0<br>2002-8-13")
var b = new xWin("2",240,200,100,100,"Wildwind's Msgbox","Welcome to visited my personal website:<br><a href=http://www14.brinkster.com/wildcity target=_blank>http://wildcity.126.com</a><br>and u can also sign my guestbook at:<br><a href=http://www14.brinkster.com/wildcity/gbook target=_blank>http://wildcity.126.com/gbook</a><br><br>thx!!! =)...")
var c = new xWin("3",200,160,250,50,"Copyright","Copyright by <a href='mailto:wildwind_zz@21cn.com'>Wildwind</a>!")
}
window.onload = initialize
//-->
</script>
</head>
<body onselectstart='return false' oncontextmenu='return false' scroll='no'>
</body>
</html>
或者
<html>
<head>
<title>用层模拟的小窗口(可拖动展合)</title>
<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312">
<style type='text/css'>
<!--
body{font-size:12px}
a:visited{text-decoration:nonecolor:slategray}
a:hover{text-decoration:underlinecolor:slategray}
a:link{text-decoration:nonecolor:slategray}
-->
</style>
<script language=JScript>
<!--
//可以打包为js文件
var x0=0,y0=0,x1=0,y1=0
var offx=6,offy=6
var moveable=false
var hover='orange',normal='#336699'//color
var index=10000//z-index
//开始拖动
function startDrag(obj)
{
if(event.button==1)
{
//锁定标题栏
obj.setCapture()
//定义对象
var win = obj.parentNode
var sha = win.nextSibling
//记录鼠标和层位置
x0 = event.clientX
y0 = event.clientY
x1 = parseInt(win.style.left)
y1 = parseInt(win.style.top)
//记录颜色
normal = obj.style.backgroundColor
//改变风格
obj.style.backgroundColor = hover
win.style.borderColor = hover
obj.nextSibling.style.color = hover
sha.style.left = x1 + offx
sha.style.top = y1 + offy
moveable = true
}
}
//拖动
function drag(obj)
{
if(moveable)
{
var win = obj.parentNode
var sha = win.nextSibling
win.style.left = x1 + event.clientX - x0
win.style.top = y1 + event.clientY - y0
sha.style.left = parseInt(win.style.left) + offx
sha.style.top = parseInt(win.style.top) + offy
}
}
//停止拖动
function stopDrag(obj)
{
if(moveable)
{
var win = obj.parentNode
var sha = win.nextSibling
var msg = obj.nextSibling
win.style.borderColor = normal
obj.style.backgroundColor = normal
msg.style.color = normal
sha.style.left = obj.parentNode.style.left
sha.style.top = obj.parentNode.style.top
obj.releaseCapture()
moveable = false
}
}
//获得焦点
function getFocus(obj)
{
if(obj.style.zIndex!=index)
{
index = index + 2
var idx = index
obj.style.zIndex=idx
obj.nextSibling.style.zIndex=idx-1
}
}
//最小化
function min(obj)
{
var win = obj.parentNode.parentNode
var sha = win.nextSibling
var tit = obj.parentNode
var msg = tit.nextSibling
var flg = msg.style.display=="none"
if(flg)
{
win.style.height = parseInt(msg.style.height) + parseInt(tit.style.height) + 2*2
sha.style.height = win.style.height
msg.style.display = "block"
obj.innerHTML = "0"
}
else
{
win.style.height = parseInt(tit.style.height) + 2*2
sha.style.height = win.style.height
obj.innerHTML = "2"
msg.style.display = "none"
}
}
//创建一个对象
function xWin(id,w,h,l,t,tit,msg)
{
index = index+2
this.id = id
this.width = w
this.height = h
this.left= l
this.top = t
this.zIndex = index
this.title = tit
this.message = msg
this.obj = null
this.bulid = bulid
this.bulid()
}
//初始化
function bulid()
{
var str = ""
+ "<div id=xMsg" + this.id + " "
+ "style='"
+ "z-index:" + this.zIndex + ""
+ "width:" + this.width + ""
+ "height:" + this.height + ""
+ "left:" + this.left + ""
+ "top:" + this.top + ""
+ "background-color:" + normal + ""
+ "color:" + normal + ""
+ "font-size:8pt"
+ "font-family:Tahoma"
+ "position:absolute"
+ "cursor:default"
+ "border:2px solid " + normal + ""
+ "' "
+ "onmousedown='getFocus(this)'>"
+ "<div "
+ "style='"
+ "background-color:" + normal + ""
+ "width:" + (this.width-2*2) + ""
+ "height:20"
+ "color:white"
+ "' "
+ "onmousedown='startDrag(this)' "
+ "onmouseup='stopDrag(this)' "
+ "onmousemove='drag(this)' "
+ "ondblclick='min(this.childNodes[1])'"
+ ">"
+ "<span style='width:" + (this.width-2*12-4) + "padding-left:3px'>" + this.title + "</span>"
+ "<span style='width:12border-width:0pxcolor:whitefont-family:webdings' onclick='min(this)'>0</span>"
+ "<span style='width:12border-width:0pxcolor:whitefont-family:webdings' onclick='ShowHide(\""+this.id+"\",null)'>r</span>"
+ "</div>"
+ "<div style='"
+ "width:100%"
+ "height:" + (this.height-20-4) + ""
+ "background-color:white"
+ "line-height:14px"
+ "word-break:break-all"
+ "padding:3px"
+ "'>" + this.message + "</div>"
+ "</div>"
+ "<div id=xMsg" + this.id + "bg style='"
+ "width:" + this.width + ""
+ "height:" + this.height + ""
+ "top:" + this.top + ""
+ "left:" + this.left + ""
+ "z-index:" + (this.zIndex-1) + ""
+ "position:absolute"
+ "background-color:black"
+ "filter:alpha(opacity=40)"
+ "'></div>"
document.body.insertAdjacentHTML("beforeEnd",str)
}
//显示隐藏窗口
function ShowHide(id,dis){
var bdisplay = (dis==null)?((document.getElementById("xMsg"+id).style.display=="")?"none":""):dis
document.getElementById("xMsg"+id).style.display = bdisplay
document.getElementById("xMsg"+id+"bg").style.display = bdisplay
}
//modify by haiwa @ 2005-7-14
//
//-->
</script>
<script language='JScript'>
<!--
function initialize()
{
var a = new xWin("1",160,200,200,200,"窗口1","xWin <br>A Cool Pop Div Window<br>Version:1.0<br>2002-8-13")
ShowHide("1","none")//隐藏窗口1
}
window.onload = initialize
//-->
</script>
</head>
<base target="_blank">
<body onselectstart='return false' oncontextmenu='return false' >
<a onclick="ShowHide('1',null)return false" href="">窗口1</a>
</body>
</html>
