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Commonly used methods and techniques for DIV CSS web page layout [transfer]_html/css_WEB-ITnose

WBOY
Release： 2016-06-24 12:28:48
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CSS布局常用的方法
float:none|left|right 
取值：
none:?默认值。对象不飘浮
left:?文本流向对象的右边
right:?文本流向对象的左边 

它是怎样工作的，看个一行两列的例子 
xhtml代码:

Example Source Code [www.52css.com]

 
这里是第一列
 
这里是第二列
 
 /*这是违背web标准意图的，只是想说明在它下面的元素需要清除浮动*/ 


CSS代码:

Example Source Code [www.52css.com]

#wrap{width:100;height:auto;} 
#column1{float:left;width:40;} 
#column2{float:right;width:60;} 
.clear{clear:both;}



position:static|absolute|fixed|relative
取值：
static:?默认值。无特殊定位，对象遵循HTML定位规则
absolute:?将对象从文档流中拖出，使用left，right，top，bottom等属性相对于其最接近的一个最有定位设置的父对象进行绝对定位。如果不存在这样的父对象，则依据body对象。而其层叠通过z-index属性定义
fixed:?未支持。对象定位遵从绝对(absolute)方式。但是要遵守一些规范
relative:?对象不可层叠，但将依据left，right，top，bottom等属性在正常文档流中偏移位置 

它来实现一行两列的例子 
xhtml代码:

Example Source Code [www.52css.com]

 
这里是第一列
 
这里是第二列
 


CSS代码:

Example Source Code [www.52css.com]

#wrap{position:relative;/*相对定位*/width:770px;} 
#column1{position:absolute;top:0;left:0;width:300px;} 
#column2{position:absolute;top:0;right:0;width:470px;} 


他们的区别在哪？
显然，float是相对定位的，会随着浏览器的大小和分辨率的变化而改变，而position就不行了，所以一般情况下还是float布局！

CSS常用布局实例
单行一列

Example Source Code [www.52css.com]

body{margin:0px;padding:0px;text-align:center;} 
#content{margin-left:auto;margin-right:auto;width:400px;} 


两行一列 

Example Source Code [www.52css.com]

body{margin:0px;padding:0px;text-align:center;} 
#content-top{margin-left:auto;margin-right:auto;width:400px;} 
#content-end{margin-left:auto;margin-right:auto;width:400px;} 


三行一列

Example Source Code [www.52css.com]

body{margin:0px;padding:0px;text-align:center;} 
#content-top{margin-left:auto;margin-right:auto;width:400px;width:370px;} 
#content-mid{margin-left:auto;margin-right:auto;width:400px;} 
#content-end{margin-left:auto;margin-right:auto;width:400px;}


单行两列

Example Source Code [www.52css.com]

#bodycenter{width:700px;margin-right:auto;margin-left:auto;overflow:auto;} 
#bodycenter#dv1{float:left;width:280px;} 
#bodycenter#dv2{float:right;width:420px;} 


两行两列

Example Source Code [www.52css.com]

#header{width:700px;margin-right:auto;margin-left:auto;overflow:auto;} 
#bodycenter{width:700px;margin-right:auto;margin-left:auto;overflow:auto;} 
#bodycenter#dv1{float:left;width:280px;} 
#bodycenter#dv2{float:right;width:420px;} 


三行两列

Example Source Code [www.52css.com]

#header{width:700px;margin-right:auto;margin-left:auto;} 
#bodycenter{width:700px;margin-right:auto;margin-left:auto;} 
#bodycenter#dv1{float:left;width:280px;} 
#bodycenter#dv2{float:right;width:420px;} 
#footer{width:700px;margin-right:auto;margin-left:auto;overflow:auto;clear:both;} 



单行三列
绝对定位 

Example Source Code [www.52css.com]

#left{position:absolute;top:0px;left:0px;width:120px;} 
#middle{margin:0px190px0px190px;} 
#right{position:absolute;top:0px;right:0px;width:120px;} 



float定位一
xhtml代码:

Example Source Code [www.52css.com]

 
 
这里是第一列
 
这里是第二列
 
/*用法web标准不建议，但是记住下面元素需要清除浮动*/ 
 
这里是第三列
 
/*用法web标准不建议，但是记住下面元素需要清除浮动*/ 
 


CSS代码:

Example Source Code [www.52css.com]

#wrap{width:100;height:auto;} 
#column{float:left;width:60;} 
#column1{float:left;width:30;} 
#column2{float:right;width:30;} 
#column3{float:right;width:40;} 
.clear{clear:both;} 



float定位二
xhtml代码：

Example Source Code [www.52css.com]

 

Thisisthemaincontent.

 
 
 

Thisistheleftsidebar.

 
 
 

Thisistherightsidebar.

 


CSS代码：

Example Source Code [www.52css.com]

body{ 
margin:0; 
padding-left:200px;/*LCfullwidth*/ 
padding-right:190px;/*RCfullwidth CCpadding*/ 
min-width:200px;/*LCfullwidth CCpadding*/ 
} 
.column{ 
position:relative; 
float:left; 
} 
#center{ 
width:100; 
} 
#left{ 
width:200px;/*LCwidth*/ 
right:200px;/*LCfullwidth*/ 
margin-left:-100; 
} 
#right{ 
width:190px;/*RCwidth*/ 
margin-right:-100; 
}

Related labels：
DIV CSS网页布局常用的方法与技巧[转]
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