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-
<span style="color: #800000;">div </span>{<span style="color: #ff0000;"> display</span>:<span style="color: #0000ff;"> -ms-flexbox</span>; }
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
<span style="color: #800000;">div </span>{<span style="color: #ff0000;"> -ms-flex-direction</span>:<span style="color: #0000ff;"> column</span>; }
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
<span style="color: #800000;">div </span>{<span style="color: #ff0000;"> -ms-flex-wrap</span>:<span style="color: #0000ff;"> wrap</span>; }
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
<span style="color: #800000;">div </span>{<span style="color: #ff0000;"> -ms-flex-flow</span>:<span style="color: #0000ff;"> row wrap</span>; }
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
<span style="color: #800000;">div </span>{<span style="color: #ff0000;"> -ms-flex-pack</span>:<span style="color: #0000ff;"> center</span>; }
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
<span style="color: #800000;">div </span>{<span style="color: #ff0000;"> -ms-flex-align</span>:<span style="color: #0000ff;"> center</span>; }
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
<span style="color: #800000;">p:nth-child(1) </span>{<span style="color: #ff0000;"> -ms-flex</span>:<span style="color: #0000ff;"> 1</span>; }<span style="color: #800000;"> p:nth-child(2) </span>{<span style="color: #ff0000;"> -ms-flex</span>:<span style="color: #0000ff;"> 3</span>; }<span style="color: #800000;"> p:nth-child(3) </span>{<span style="color: #ff0000;"> -ms-flex</span>:<span style="color: #0000ff;"> 1</span>; }
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
<span style="color: #800000;">p:nth-child(1) </span>{<span style="color: #ff0000;"> -ms-flex-order</span>:<span style="color: #0000ff;"> 2</span>; }<span style="color: #800000;"> p:nth-child(2) </span>{<span style="color: #ff0000;"> -ms-flex-order</span>:<span style="color: #0000ff;"> 3</span>; }<span style="color: #800000;"> p:nth-child(3) </span>{<span style="color: #ff0000;"> -ms-flex-order</span>:<span style="color: #0000ff;"> 1</span>; }

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