最近学到了几种关于左右固定宽度，中间自适应的三列布局的方法，整理了一下，在这里跟大家一起分享分享，其中有什么不足的还望各位给指导指导哈。
首先我想到的是float——浮动布局
使用浮动，先渲染左右两个元素，分别让他们左右浮动，然后再渲染中间元素，设置它的margin左右边距分别为左右两个元素的宽度。例如以下代码就可以实现我们想要的三列效果啦。
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body> <div style="width:300px; float:left; background:#6FF">左侧的内容 固定宽度</div> <div style="width:200px; float:right; background-color:#960">右侧的内容 固定宽度</div> <div style="margin-left:300px;margin-right:200px; background-color:#9F3;">中间内容，自适应宽度</div></body></html>
其次我想到了position——定位
使用定位方式，不需要先渲染中间元素，只要把左右两个元素分别使用定位，left:0;right:0;中间元素设置margin左右边距为左右两个元素的宽度即可。
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style>.left{ width:200px; height:500px; position: absolute; top:0; left:0; background:blue;}.center{ margin-left: 200px; margin-right: 300px; height:500px; background-color: green;}.right{width:300px;height:500px;position: absolute;;top:0;right:0;background: blue;} </style></head><body> <div class="left">左边</div> <div class="center">中间</div> <div class="right">右边</div></body></html> 第三、使用双飞翼布局
使用双飞翼布局与其他方式不同，它最先渲染的是中间元素，然后才渲染两边元素（注意，这一点与float布局方式正好相反哟），先将三个元素都设置为向左浮动，然后使用负边距将左右两个元素覆盖到中间元素的左右两边，形成羽翼。
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style>.middle{ float: left; width: 100%; height: 50px; background-color: #fff9ca;}.middle-wrap{ margin: 0 200px 0 150px;}.left{ float: left; width: 150px; height: 50px; background-color: red; margin-left: -100%; /*负边距的作用就是让左边div盖在中间div上面*/}.right{ float: left; width: 200px; height: 50px; background-color: yellow; margin-left: -200px; /*让右边的div覆盖在中间的div右边*/} </style></head><body> <div class="middle"> <div class="middle-wrap">middle</div> </div> <div class="left">left</div> <div class="right">right</div></body></html> 双飞翼布局的最大优点是它的兼容性——可以兼容到IE6.
最后我还想说说CSS3的flex布局方法
该方式的思想是设置一个弹性容器包裹三个元素，并将这个容器设置为水平排列（flex-flow:row）,左右两边元素设置固定宽度，中间元素设置为flex:1;
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style>.flex { display: flex; flex-flow: row;}.left{ width: 200px; height: 50px; background-color: red;}.center{ flex: 1; height: 50px; background-color: #fff9ca;}.right { width: 300px; height: 50px; background-color: yellow;} </style></head><body><div class="flex"> <div class="left">左边</div> <div class="center">中间</div> <div class="right">右边</div></div></body></html> 但不得不说的是flex布局的兼容性还不够完善，所以个人不推荐使用这种方式布局。
嘿嘿，以上就是我能想到的实现左右固定，中间自适应的三列布局的几种方式啦啦啦
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