说到自适应布局，我们曾在“抛砖引玉之宽度自适应布局”一文中学习过。当时的核心思想主要是利用float+margin的形式。利用块状元素的流体特性，然后计算出float元素的宽度，并赋予到块状元素的相应margin中。但是这么做是有个缺点的，就是我们每次都得知道float元素的宽度，然后赋予到块状元素的margin。
然而，我们在”BFC之浅析篇”中学习到BFC有一特性：BFC的区域不会与外部浮动元素重叠。并且利用了这一特性，实现了两栏自适应布局。我们再来回顾下。
<!DOCTYPE html> <head> <title>BFC</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <style> .leftDiv { width:100px; height:100px; background:green; float:left; } .normalDiv { height:100px; background:pink; /*添加overflow:hidden，触发元素BFC*/ overflow:hidden; } </style> </head> <body> <div class="leftDiv"></div> <div class="normalDiv"> </div> </body></html> 运行代码，截图为下
可以看见浮动元素（绿色方块）与div.noramDiv元素的确木有发生重叠，而且我也没有加margin哦。
你也可以自己运行下上述代码，伸缩页面宽度，可以发现也的确是自适应滴。
（PS：上面所示的BFC实现两栏自适应的例子，可以和“float实例讲解”对比学习下，效果会更加哦。）
我们上面是利用的overflow:hidden;来触发div.normalDiv的BFC。在“BFC之浅析篇”中，我们学习到要触发元素成为BFC，有如下几种方法：
1、 float属性不为none
2、 position为absolute或fixed
3、 overflow的值不为visible
4、 display的值为table-cell，table-caption，inline-block中的任何一个。
抛开第三点，overflow的值不为visible，其他几种也适合实现BFC自适应布局？
当然不是咯。
首先，针对第一点float，由于float触发元素BFC后，自身float又带有特性，如将元素包裹化了，破坏了块级元素的流体性，所以不能用来自适应布局。
针对第二点position，又由于position将元素脱离文档流比较严重，因此，更加不能用来自适应布局。
针对，第四点中 display:table-cell，当你设置一个比宽度无线大时，它也不会超过它容器的宽度。
啧啧啧！这不就完美了么。那么我们设置它的宽度为很大很大时，也就可以用来自适应布局了嘛。
看看如下代码
<!DOCTYPE html> <head> <title>BFC</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <style> .leftDiv { width:100px; height:100px; background:green; float:left; } .normalDiv { height:100px; background:pink; /*添加display:table-cell，且将宽度设置为很大，如9000px*/ display:table-cell; width:9000px; } </style> </head> <body> <div class="leftDiv"></div> <div class="normalDiv"></div> </body></html> 运行代码后，效果图见上。
ps:自己运行后的体会更深哦，然后伸缩浏览器，哈哈哈，试了就知道，是可以的哦。
针对第四点中的display:table-caption，直接滤过！
针对第四点钟的display:inline-block，由于和float一样具有包裹性，所以滤过。但是，我们曾在"BFC之清除浮动篇&clear"中提到过IE6、7有个hasLayout嘛，在IE6、7中它可是具有流体特性的哦。所以可以解决IE6、7的自适应布局。代码如下
.floatElm { float: left;}.bftContent { display: inline-block;} so， 对触发BFC的方法，能用在自适应布局中的方法如下
overflow（hidden/auto） |
缺点： 1、 overflow:hidden当内容过多时，带有剪裁功能 2、 overflow:auto当内容过多时，会出现滚动条 |
display:inline-block |
缺点： 只适用于IE6、7 |
display:table-cell |
缺点： 只适用于IE8+和其他浏览器 |
终上所述，我们可以得到利用BFC实现自适应布局的通用方法如下：
.floatElm { float:left;}.bfcContent { display:table-cell; width:9000px;/*宽度大到屏幕宽度即可*/ /*hack手段，针对IE6、7*/ *display:inline-block; *width:auto;} 好了，我们利用这个方法来实现实现三栏布局玩玩。代码如下：
<!-- 左右宽度为100px，中间自适应--><!DOCTYPE html> <head> <title>BFC</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <style> .floatLeft,.floatRight { width:100px; height:100px; } .floatLeft { /*左浮动触发BFC*/ float:left; background:green; } .floatRight { /*右浮动触发BFC*/ float:right; background:yellow; } .bfcContent { /*table-cell触发BFC*/ display:table-cell; width:9000px;/*宽度大到屏幕宽度即可*/ /*hack手段，针对IE6、7*/ *display:inline-block; *width:auto; height:100px; background:pink; } </style> </head> <body> <div class="floatLeft"></div> <div class="floatRight"></div> <div class="bfcContent bfcContentStl"></div> </body></html>
不信，自己运行代码，拉动浏览器看看啦。
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