前面的话

　　前面已经介绍过单列定宽单列自适应和两列自适应的两列布局。本文介绍三列布局，分为两侧定宽中间自适应、两列定宽一侧自适应、中间定宽两侧自适应、一侧定宽两列自适应和三列自适应这五种情况

两侧定宽中间自适应

思路一:  float

【1】float + margin + calc

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left,.right{float: left;width: 100px;}

.center{float: left; width:calc(100% - 240px);margin: 0 20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

【2】float + margin + (fix)

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left,.right{position: relative;float: left;width: 100px;}

.centerWrap{float: left; width:100%; margin: 0 -100px;}

.center{margin: 0 120px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="centerWrap" style="background-color: red;">

        <div class="center" style="background-color: pink;">

            <p>center</p>

            <p>center</p>

        </div>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

思路二: inline-block

【1】inline-block + margin + calc

<style>

p{margin: 0;}

.parent{font-size: 0;}

.left,.right,.center{display:inline-block; vertical-align: top;font-size: 16px;}

.left,.right{width: 100px;}

.center{width: calc(100% - 240px); margin: 0 20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

【2】inline-block + margin + (fix)

<style>

p{margin: 0;}

.parent{font-size: 0;}

.left,.right,.centerWrap{display:inline-block; vertical-align: top;font-size: 16px;}

.left,.right{width: 100px;position:relative;}

.centerWrap{width: 100%; margin: 0 -100px;}

.center{margin: 0 120px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="centerWrap" style="background-color: orange;">

        <div class="center" style="background-color: pink;">

            <p>center</p>

            <p>center</p>

        </div>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

思路三: table

<style>

p{margin: 0;}

.parent{display: table; width: 100%;table-layout: fixed;}

.left,.right,.centerWrap{display:table-cell;}

.left,.right{width: 100px;}

.center{margin: 0 20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="centerWrap" style="background-color: orange;">

        <div class="center" style="background-color: pink;">

            <p>center</p>

            <p>center</p>

        </div>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

思路四: absolute

<style>

p{margin: 0;}

.parent{position: relative;height:40px;}

.left,.right,.center{position: absolute;}

.left{left: 0;width:100px;}

.right{right: 0;width: 100px;}

.center{left: 120px; right: 120px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

思路五: flex

<style>

p{margin: 0;}

.parent{display: flex;}

.left,.right{width: 100px;}

.center{flex: 1; margin: 0 20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

思路六: grid

<style>

p{margin: 0;}

.parent{display: grid;grid-template-columns:100px 1fr 100px; grid-gap:20px;}

</style>

两列定宽一侧自适应

　　这种布局与单列定宽单列自适应布局非常相似

思路一: float

【1】float + margin

　　缺点是IE6-浏览器的3px的bug，以及当自适应列中有元素清除浮动时，会使该元素不与左侧浮动元素同行，从而出现文字下沉现象

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left,.center{float: left;width: 100px;margin-right: 20px;}

.right{margin-left: 240px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

【2】float + margin + calc

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left,.center{float: left;width: 100px;margin-right: 20px;}

.right{float: left; width: calc(100% - 240px);}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

【3】float + margin + (fix)

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left,.center{position: relative; float: left;width: 100px;margin-right: 20px;}

.rightWrap{float: left; width: 100%; margin-left: -240px;}

.right{margin-left:240px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="rightWrap">

        <div class="right"  style="background-color: lightgreen;">

            <p>right</p>

            <p>right</p>

        </div>

    </div>

</div>

【4】float + overflow

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left,.center{position: relative; float: left;width: 100px;margin-right: 20px;}

.right{overflow: hidden;zoom:1;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路二: inline-block

【1】inline-block + margin + calc

<style>

p{margin: 0;}

.parent{font-size: 0;}

.left,.right,.center{display:inline-block; vertical-align: top;font-size: 16px;}

.left,.center{width: 100px;margin-right:20px;}

.right{width: calc(100% - 240px);}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

【2】inline-block + margin + (fix)

<style>

p{margin: 0;}

.parent{font-size: 0;}

.left,.rightWrap,.center{display:inline-block; vertical-align: top;font-size: 16px;}

.left,.center{position: relative;width: 100px;margin-right:20px;}

.rightWrap{width:100%; margin-left: -240px;}

.right{margin-left: 240px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="rightWrap" style="background-color: green;">

        <div class="right"  style="background-color: lightgreen;">

            <p>right</p>

            <p>right</p>

        </div>

    </div>

</div>

思路三: table

<style>

p{margin: 0;}

.parent{display: table; width: 100%;table-layout: fixed;}

.leftWrap,.centerWrap,.right{display:table-cell;}

.leftWrap,.centerWrap{width: 120px;}

.left,.center{margin-right: 20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="leftWrap">

        <div class="left" style="background-color: lightblue;">

            <p>left</p>

        </div>

    </div>

    <div class="centerWrap">

        <div class="center" style="background-color: pink;">

            <p>center</p>

        </div>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路四: absolute

<style>

p{margin: 0;}

.parent{position: relative;width:100%;height:40px;}

.left{position: absolute;left:0;width:100px;}

.center{position: absolute;left:120px;width: 100px;}

.right{position: absolute;left:240px; right:0;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路五: flex

<style>

p{margin: 0;}

.parent{display: flex;}

.left,.center{width:100px;margin-right:20px;}

.right{flex:1;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路六: grid

<style>

p{margin: 0;}

.parent{display: grid;grid-template-columns:100px 100px 1fr; grid-gap:20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

中间定宽两侧自适应布局

思路一: float

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left{float: left;margin-right: 20px;}

.center{float: left;width: 100px;margin-right: 20px;}

.right{overflow: hidden;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路二: table

<style>

p{margin: 0;}

.parent{display: table; width: 100%;}

.leftWrap{display: table-cell; width: 0.1%;}

.centerWrap{display: table-cell;width: 120px;}

.left,.center{margin-right: 20px;}

.right{display:table-cell;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="leftWrap">

        <div class="left" style="background-color: lightblue;">

            <p>left</p>

            <p>left</p>

        </div>

    </div>

    <div class="centerWrap">

        <div class="center" style="background-color: pink;">

            <p>center</p>

        </div>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路三: flex

<style>

p{margin: 0;}

.parent{display: flex;}

.left{margin-right: 20px;}

.center{width: 100px;margin-right: 20px;}

.right{flex: 1;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路四: grid

<style>

p{margin: 0;}

.parent{display: grid;grid-template-columns:auto 100px 1fr; grid-gap:20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

一侧定宽两列自适应

思路一: float

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left{float: left;width: 100px;margin-right: 20px;}

.center{float: left;margin-right: 20px;}

.right{overflow: hidden;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路二: table

<style>

p{margin: 0;}

.parent{display: table; width: 100%;}

.leftWrap{display: table-cell; width: 120px;}

.centerWrap{display: table-cell;width: 0.1%;}

.left,.center{margin-right: 20px;}

.right{display:table-cell;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="leftWrap">

        <div class="left" style="background-color: lightblue;">

            <p>left</p>

        </div>

    </div>

    <div class="centerWrap">

        <div class="center" style="background-color: pink;">

            <p>center</p>

            <p>center</p>

        </div>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路三: flex

<style>

p{margin: 0;}

.parent{display: flex;}

.left{width: 100px;margin-right: 20px;}

.center{margin-right: 20px;}

.right{flex: 1;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路四: grid

<style>

p{margin: 0;}

.parent{display: grid;grid-template-columns:100px auto 1fr; grid-gap:20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

三列自适应

思路一: float

<style>

p{margin: 0;}

.parent{overflow: hidden;}

.left,.center{float: left;margin-right: 20px;}

.right{overflow: hidden;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路二: table

<style>

p{margin: 0;}

.parent{display: table; width: 100%;}

.leftWrap,.centerWrap{display: table-cell;width: 0.1%;}

.left,.center{margin-right: 20px;}

.right{display:table-cell;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="leftWrap">

        <div class="left" style="background-color: lightblue;">

            <p>left</p>

            <p>left</p>

        </div>

    </div>

    <div class="centerWrap">

        <div class="center" style="background-color: pink;">

            <p>center</p>

            <p>center</p>

        </div>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路三: flex

<style>

p{margin: 0;}

.parent{display: flex;}

.left,.center{margin-right: 20px;}

.right{flex: 1;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

        <p>right</p>

    </div>

</div>

思路四: grid

<style>

p{margin: 0;}

.parent{display: grid;grid-template-columns:auto auto 1fr; grid-gap:20px;}

</style>
<div class="parent" style="background-color: lightgrey;">

    <div class="left" style="background-color: lightblue;">

        <p>left</p>

    </div>

    <div class="center" style="background-color: pink;">

        <p>center</p>

        <p>center</p>

    </div>

    <div class="right"  style="background-color: lightgreen;">

        <p>right</p>

    </div>

</div>

总结

　　三列布局类似于大号的两列布局。无论是什么布局方式，无外乎需要应用float、inline-block、table、absolute、flex、grid这6种布局属性，然后再配合负margin、calc()函数、bfc、增加结构等来实现布局

　　自适应包括两种情况：一种是宽度由内容撑开，一种是宽度自动撑满父元素剩余宽度

　　可实现宽度由内容撑开的属性有： float、inline、inline-block、table、table-cell、absolute、fixed、flex、grid

　　可实现宽度自动撑满父元素剩余宽度的属性有： overflow(配合float)、table、flex、grid

　　

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