1.两边固定 当中自适应
2.当中列要完整显示
3.当中列要优先加载
浮动: 搭建完整的布局框架
margin 为赋值:调整旁边两列的位置(使三列布局到一行上)
使用相对定位:调整旁边两列的位置（使两列位置调整到两头）
!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
body{
min- 600px;
}
#content{
padding: 0 200px;
}
#header,#footer{
height: 20px;
text-align: center;
border: 1px solid deeppink;
background: gray;
}
#content .middle{
float: left;
100%;
background: pink;
/*padding: 0 200px;*/
}
#content .left{
position: relative;
left: -200px;
margin-left: -100%;
float: left;
200px;
background: yellow;
}
#content .right{
position: relative;
right: -200px;
margin-left: -200px;
float: left;
200px;
background: yellow;
}
.clearfix{
*zoom: 1;
}
.clearfix:after{
content: "";
display: block;
clear: both;
}
</style>
</head>
<body>
<div id="header">header</div>
<div id="content" class="clearfix">
<div class="middle">
<h4>middle</h4>
<!--<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>-->
</div>
<div class="left">left</div>
<div class="right">right</div>
</div>
<div id="footer">footer</div>
</body>
</html>
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
中间加入无限增高
<!--
1.两边固定 当中自适应
2.当中列要完整显示
3.当中列要优先加载
-->
<!--
浮动: 搭建完整的布局框架
margin 为赋值:调整旁边两列的位置(使三列布局到一行上)
使用相对定位:调整旁边两列的位置（使两列位置调整到两头）
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>圣杯布局</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
body{
min-600px;
}
#content{
overflow: hidden;
padding: 0 200px;
}
#header, #footer{
height: 20px;
text-align: center;
border: 1px solid deeppink;
background: gray;
}
#content .middle, #content .left, #content .right{
padding-bottom: 10000px;
margin-bottom:-10000px;
}
#content .middle{
float: left;
100%;
background: pink;
/*padding: 0 200px;*/
}
#content .left{
background: yellow;
position: relative;
float: left;
200px;
/*100%提升一层*/
margin-left: -100%;
/*根据父级左右padding 200px; 让他据左边 */
left:-200px;
}
#content .right
{
background:yellow;
position: relative;
float: left;
200px;
/*-200px提升一层*/
margin-left: -200px;
right: -200px;
}
.clearfix{
zoom: 1;
}
.clearfix:after{
content:"";
display: block;
clear:both;
}
</style>
</head>
<body>
<div id="header">header</div>
<div id="content" class="clearfix">
<div class="middle">
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
<h4>middle</h4>
</div>
<div class="left">left</div>
<div class="right">right</div>
</div>
<div id="footer">footer</div>
</body>
</html>
