DIV+CSS自适应布局 - holiday1123
自适应布局分两类：高度和宽度，方法有很多，我用三列布局举例，我就列几个通俗易懂的例子呗，懂了三列的，两列的原理一样，呵呵哒。
效果图如下：高度自适应——宽度自适应
1,高度自适应布局
原理就是把每个模块设置为绝对定位，然后设置中间自适应的模块的top和bottom属性的值分别为头部模块和底部模块的高，然后中间模块的高度就自适应了。代码如下：
html代码：
<span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="top"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
120px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="main"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
自适应
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="bottom"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
120px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span></span></span></span></span>
css代码：
<span style="color: #800000;">.top</span>{<span style="color: #ff0000;">
width</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 120px</span>;<span style="color: #ff0000;">
position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> greenyellow</span>;
}<span style="color: #800000;">
.main</span>{<span style="color: #ff0000;">
position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;">
width</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
top</span>:<span style="color: #0000ff;"> 120px</span>;<span style="color: #ff0000;">
bottom</span>:<span style="color: #0000ff;"> 120px</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> azure</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> auto</span>;
}<span style="color: #800000;">
.bottom</span>{<span style="color: #ff0000;">
position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;">
bottom</span>:<span style="color: #0000ff;"> 0</span>;//别漏了<span style="color: #ff0000;">
width</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 120px</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;">greenyellow </span>;
}
2,宽度自适应，有三种方法，分别是用绝对定位；利用margin，中间模块先渲染；自身浮动。
a，用绝对定位来设置宽度自适应布局，原理：针对自适应模块使用绝对定位，在把left和right设置为左右两列的宽，其实原理和高度自适应一样，另外左右两列分别左右浮动。
html代码：
<span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="left"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
200px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="main"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
自适应
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="right"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
200px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span></span></span></span></span>css代码：
<span style="color: #800000;">html,
body </span>{<span style="color: #ff0000;">
margin</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
padding</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;">
font-size</span>:<span style="color: #0000ff;"> 30px</span>;<span style="color: #ff0000;">
font-weight</span>:<span style="color: #0000ff;"> 500</span>;<span style="color: #ff0000;">
text-align</span>:<span style="color: #0000ff;"> center</span>;
}<span style="color: #800000;">
.left,
.right </span>{<span style="color: #ff0000;">
width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;">
display</span>:<span style="color: #0000ff;"> inline</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> greenyellow</span>;
}<span style="color: #800000;">
.left </span>{<span style="color: #ff0000;">
float</span>:<span style="color: #0000ff;"> left</span>;
}<span style="color: #800000;">
.right </span>{<span style="color: #ff0000;">
float</span>:<span style="color: #0000ff;"> right</span>;
}<span style="color: #800000;">
.main </span>{<span style="color: #ff0000;">
position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;">
left</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;">
right</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> azure</span>;<span style="color: #ff0000;">
display</span>:<span style="color: #0000ff;"> inline</span>;
}b，中间一列优先渲染的自适应三列布局，优先渲染（加载）的关键：内容在html里面必须放在前面。自适应的div必须放在left和right前面且包含在一个父div里。父div，left和right模块都向左浮动，然后对自适应的div（就是父div里的子div）设置margin：0 200px，然后对left的margin-left的属性值设置为100%的负数，就是margin-left：-100%；对right的margin-left的属性值设置为自身宽度的负数，就是margin-left：-200px。
注意：自适应的div必须放在left和right前面且包含在一个父div里。
html代码：
<span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="main"</span><span style="color: #0000ff;">></span> <span style="color: #008000;"><!--</span><span style="color: #008000;">看清楚，这里用一个父div包住</span><span style="color: #008000;">--></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="content"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
自适应
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="left"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
200px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="right"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
200px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span></span></span></span></span></span>css代码：
<span style="color: #800000;">html,
body </span>{<span style="color: #ff0000;">
margin</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
padding</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;">
font-size</span>:<span style="color: #0000ff;"> 30px</span>;<span style="color: #ff0000;">
font-weight</span>:<span style="color: #0000ff;"> 500</span>;<span style="color: #ff0000;">
text-align</span>:<span style="color: #0000ff;"> center</span>;
}<span style="color: #800000;">
.main </span>{<span style="color: #ff0000;">
width</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
float</span>:<span style="color: #0000ff;"> left</span>;
}<span style="color: #800000;">
.main .content </span>{<span style="color: #ff0000;">
margin</span>:<span style="color: #0000ff;"> 0 200px</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> azure</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;
}<span style="color: #800000;">
.left,
.right </span>{<span style="color: #ff0000;">
width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
float</span>:<span style="color: #0000ff;"> left</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> greenyellow</span>;
}<span style="color: #800000;">
.left </span>{<span style="color: #ff0000;">
margin-left</span>:<span style="color: #0000ff;"> -100%</span>;<span style="color: #ff0000;"> //important
</span>}<span style="color: #800000;">
.right </span>{<span style="color: #ff0000;">
margin-left</span>:<span style="color: #0000ff;"> -200px</span>;<span style="color: #ff0000;"> //important
</span>}c，自身浮动，原理：中间列设置margin属性，就是把左右列分别左右浮动。注意：使用这个方法布局自适应的话，必须把自适应的那一列在html中放在left和right后面。
html代码：
<span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="left"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
200px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="right"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
200px
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="main"</span><span style="color: #0000ff;">></span><span style="color: #000000;">
自适应
</span><span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span></span></span></span></span>css代码：
<span style="color: #800000;">html,
body </span>{<span style="color: #ff0000;">
margin</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
padding</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;">
font-size</span>:<span style="color: #0000ff;"> 30px</span>;<span style="color: #ff0000;">
font-weight</span>:<span style="color: #0000ff;"> 500</span>;<span style="color: #ff0000;">
text-align</span>:<span style="color: #0000ff;"> center</span>;
}<span style="color: #800000;">
.main </span>{<span style="color: #ff0000;">
margin</span>:<span style="color: #0000ff;"> 0 200px</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> azure</span>;
}<span style="color: #800000;">
.left,
.right </span>{<span style="color: #ff0000;">
width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;">
height</span>:<span style="color: #0000ff;"> 100%</span>;<span style="color: #ff0000;">
background-color</span>:<span style="color: #0000ff;"> greenyellow</span>;
}<span style="color: #800000;">
.left </span>{<span style="color: #ff0000;">
float</span>:<span style="color: #0000ff;"> left</span>;
}<span style="color: #800000;">
.right </span>{<span style="color: #ff0000;">
float</span>:<span style="color: #0000ff;"> right</span>;
}
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