HTML/CSS学习之三列布局，其中左侧和右侧的部分宽度固定，中间部分宽度随浏览器宽度的变化而自适应变化

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第一种方法：绝对定位

<!DOCTYPE html>
<html>
<head>
<title>三列布局</title>
<link rel="stylesheet" type="text/css" href="task0001.css">
</head>
<body> <div class="wrap">
<div>三列布局1</div>
<div class="one col-3-one">one</div>
<div class="three col-3-three">three</div>
<div class="two col-3-two">two</div>
</div> </body>
</html>

.wrap {
position: relative;
}.one{
width: 40px;
background: blue;
}.two {
background: yellow;
}.three {
width: 40px;
background: red;
}.col-3-one {
position: absolute;
left: 0px;
}.col-3-three {
position: absolute;
right: 0px;
}.col-3-two {
position: static;
margin-left: 40px;
margin-right: 40px;
}

第二种方法：浮动定位

<!DOCTYPE html>
<html>
<head>
<title>三列布局</title>
<link rel="stylesheet" type="text/css" href="task0001.css">
</head>
<body> <div >
<div>三列布局2</div>
<div class="one col-3-one-float">one</div>
<div class="three col-3-three-float">three</div>
<div class="two col-3-two">two</div>
</div>
</body>
</html>

.wrap {
position: relative;
}.one{
width: 40px;
background: blue;
}.two {
background: yellow;
}.three {
width: 40px;
background: red;
}.col-3-two {
position: static;
margin-left: 40px;
margin-right: 40px;
}.col-3-one-float {
float: left;}.col-3-three-float {
float: right;
}