1.百分比布局：所有的百分比都是相对父级的
Div{ Width：50%;}div的宽是它父级元素的百分之五十
2.双飞翼布局
中间固定两边自适应
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>双飞翼布局</title>
<style type="text/css">
.left, .center, .right {
float: left;
min-height: 130px;
text-align: center;
}
.left {
margin-left: -100%;
background: green;
width: 200px;
}
.right {
margin-left: -300px;
background-color: red;
width: 300px;
}
.center {
background-color: blue;
width: 100%;
}
.center1{
margin: 0 300px 0 200px;
}
</style>
</head>
<body>
<div class="cont">
<div class="center">
<div class="center1">center</div>
</div>
<div class="left">left</div>
<div class="right">right</div>
</div>
</body>
</html>
3.圣杯布局
两端固定中间自适应
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>圣杯布局</title>
<style type="text/css">
.cont {
padding: 0 300px 0 200px;
}
.left, .center, .right {
position: relative;
min-height: 130px;
float: left;
}
.left {
left: -200px;
margin-left: -100%;
background: green;
width: 200px;
}
.right {
right:-300px;
margin-left: -300px;
background-color: red;
width: 300px;
}
.center {
background-color: blue;
width: 100%;
}
</style>
</head>
<body>
<div class="cont">
<div class="center">中间</div>
<div class="left">左边</div>
<div class="right">右边</div>
</div>
</body>
</html>
Margin-right设置为整数 不会对自身元素造成影响 让平行元素往右移动
Margin-right设置为负数 自身元素就会向右移动