css 三列布局

常用的几种3列布局,即左右两边宽度固定,中间自适应,这也是css面试中大概率会问的问题。

主要有以下几种方式:

圣杯布局

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<div class="container">
<div class="main"></div>
<div class="sub"></div>
<div class="extra"></div>
</div>
.container {
padding-left: 210px;
padding-right: 190px;
}
.main {
float: left;
width: 100%;
height: 300px;
background-color: rgba(255, 0, 0, .5);
}
.sub {
position: relative;
left: -210px;
float: left;
width: 200px;
height: 300px;
margin-left: -100%;
background-color: rgba(0, 255, 0, .5);
}
.extra {
position: relative;
right: -190px;
float: left;
width: 180px;
height: 300px;
margin-left: -180px;
background-color: rgba(0, 0, 255, .5);
}

双飞翼布局

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<div class="main-wrapper">
<div class="main"></div>
</div>
<div class="sub"></div>
<div class="extra"></div>
.main-wrapper {
float: left;
width: 100%;
}
.main {
height: 300px;
margin-left: 210px;
margin-right: 190px;
background-color: rgba(255, 0, 0, .5);
}
.sub {
float: left;
width: 200px;
height: 300px;
margin-left: -100%;
background-color: rgba(0, 255, 0, .5);
}
.extra {
float: left;
width: 180px;
height: 300px;
margin-left: -180px;
background-color: rgba(0, 0, 255, .5);
}

table 布局

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<div class="container">
<div class="sub"></div>
<div class="main"></div>
<div class="extra"></div>
</div>
.container{
display: table;
width: 100%;
table-layout: fixed;
}
.sub{
width: 180px;
height: 300px;
background-color: rgba(0, 255, 0, .5);
display: table-cell;
}
.extra{
width: 180px;
height: 300px;
background-color: #ddd;
display: table-cell;
}
.main{
width: 100%;
height: 300px;
background-color: rgba(255, 0, 0, .5);
display: table-cell;
}

flex布局

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.container{
display: flex;
}
.sub{
width: 180px;
height: 300px;
background-color: rgba(0, 255, 0, .5);
}
.extra{
width: 180px;
height: 300px;
background-color: #ddd;
}
.main{
flex: 1;
height: 300px;
background-color: rgba(255, 0, 0, .5);
}
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