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HomeWeb Front-endHTML Tutorial第 29 章 CSS3 弹性伸缩布局[中]_html/css_WEB-ITnose

学习要点:

1.混合过度版

 

主讲教师:李炎恢

 

本章主要探讨 HTML5 中 CSS3 提供的用来实现未来响应式弹性伸缩布局方案,这里做一个初步的了解。

 

一.混合过渡版

混合版本的 Flexbox 模型是 2011 年提出的工作草案,主要是针对 IE10 浏览器实现的伸缩布局效果,其功能和旧版本的属性大同小异。我们还是采用上一节课的文件,然后使用混合过渡代码,实现 IE10 的伸缩布局。

首先,设置伸缩盒的 display 有如下两个属性值:

属性值

说明

flexbox

将容器盒模型作为块级弹性伸缩盒显示(混合版本)

inline-flexbox

将容器盒模型作为内联级弹性伸缩盒显示(混合版本)

//需要 IE 前缀-ms-

div {    display: -ms-flexbox;}

1.flex-direction

flex-direction 属性和旧版本 box-orient 属性一样,都是设置伸缩项目的排列方式。

//设置从上往下排列 

div {    -ms-flex-direction: column;}

属性值

说明

row

设置从左到右排列

row-reverse

设置从右到左排列

column

设置从上到下排列

column-reverse

设置从下到上排列

2.flex-wrap

flex-wrap 属性类似与旧版本中的 box-lines,但是 box-lines 我们没有讲解,原因是没有浏览器支持它。

//设置无法容纳时,自动换行

div {    -ms-flex-wrap: wrap;}

属性值

说明

nowrap

默认值,都在一行或一列显示

wrap

伸缩项目无法容纳时,自动换行

wrap-reverse

伸缩项目无法容纳时,自动换行,方向和 wrap 相反

3.flex-flow

flex-flow 属性是集合了排列方向和控制换行的简写形式。

//简写形式

div {    -ms-flex-flow: row wrap;}

4.flex-pack

flex-pack 属性和旧版本中的 box-pack 一样,设置伸缩项目的对其方式。

//按照中心点对齐 

div {    -ms-flex-pack: center;}

属性值

说明

start

伸缩项目以起始点靠齐

end

伸缩项目以结束点靠齐

center

伸缩项目以中心点靠齐

justify

伸缩项目平局分布

 5.flex-align

flex-align 属性和旧版本中的 box-align 一样,处理伸缩项目容器的额外空间。

//处理额外空间 

div {    -ms-flex-align: center;}

属性值

说明

start

伸缩项目以顶部为基准,清理下部额外空间

end

伸缩项目以底部为基准,清理上部额外空间

center

伸缩项目以中部为基准,平均清理上下部额外空间

baseline

伸缩项目以基线为基准,清理额外的空间

stretch

伸缩项目填充整个容器,默认

6.flex

flex 属性和旧版本中的 box-flex 类似,用来控制伸缩容器的比例分配。

//设置比例分配

p:nth-child(1) {    -ms-flex: 1;}p:nth-child(2) {    -ms-flex: 3;}p:nth-child(3) {    -ms-flex: 1;}

7.flex-order

flex-order 属性和 box-ordinal-group 属性一样控制伸缩项目出现的顺序。

//设置伸缩项目顺序

p:nth-child(1) {    -ms-flex-order: 2;}p:nth-child(2) {    -ms-flex-order: 3;}p:nth-child(3) {    -ms-flex-order: 1;}

 

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