统一下载站 零度软件园 绿色软件 久友下载站 星星软件站 源码下载 游戏狗 51CTO下载 下载王 东坡下载 创e下载园 顶库下载 完美下载 绿软基地 当贝客 比克尔瞎子 软件E线下载 121下载站 快猴网 心愿下载 偶要下载站 华彩软件站 第六下载 雷达下载 ucbug软件下载站 维维软件园 欧普软件 动力软件园 游侠下载站 迷你下载 喜爱下载网 咕咕猪下载站 清清下载吧 AI下载 艾艾软件园 2秒下载网 谷普下载 飞翔下载 S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S 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S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S
欢迎来到DIVCSS5查找CSS资料与学习DIV CSS布局技术!
您的位置:DIVCSS5学习网 > DIV+CSS基础 >

CSS基础必学列表

css left right top bottom定位

DIVCSS5学习网 left right top bottom定位

这四个DIVCSS5学习网属性样式用于定位对象盒子,必须定义position属性值为absolute或者relative此取值方可生效。

一、语法结构   -   TOP

Left、right、top、bottom后跟数字+html单位。

示范结构
div{left:20px}
div{right:20px}
div{top:20px}
div{bottom:20px}

Left 靠左距离多少
Right 靠右边距离多少
Top 距离顶部距离多少
Bottom距离下边距离多少

二、使用条件   -   TOP

通常单独使用left、right、top、bottom均无效,需要在使用绝对定位CSS position样式才能生效。

一般left和right在一个样式是只能使用其一,不能left和right都设置,要么使用left就不使用right,要么使用right就不使用left,如果left和right均使用将会出现兼容问题,一个对象设置了靠左left多少距离,自然右边距离自然就有了所以无需设置左边。

相同道理,top和bottom对一个对象只能使用其一,不然会出现逻辑兼容问题。譬如一个人让你往左走,一个人让你往右走,同时发出往左往右走这个时候你也不好判断往那边走。

三、绝对定位中使用   -   TOP

一般left、right、top、bottom使用于配合position定位对象位置。大家可以进入CSS position教程篇了解学习这些样式属性。

扩展阅读:
Position:absolute
Position:relative

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必备CSS教程 Essential CSS Tutorials

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DIVCSS5学习网文章修订日期:2013-02-13 21:35 原创:DIVCSS5学习网
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