30行代码搞定css3通用flex布局

背景：网上有很多讲解flex布局的，解释各种属性的效果。如果不熟悉的可以先自行了解一下，本文主要是讲如何使用封装好的样式库，已方便在各地地方引用，实现一劳永逸。不到30行的样式库在最后，可直接放在单独文件全局引用。

1、实现水平从左到右布局：flex-row-start-start

下面的html结构都和这一样，固只截取效果。

2、水平中间布局：flex-row-center-start

3、水平从右到左布局：flex-row-end-start

4、水平布局垂直铺满：flex-row-start-stretch

5、上面都是容器父元素，配合子元素的使用。水平方向指定一个元素占满剩余空间：父flex-row-start-start，指定子flex-1

6、水平布局空间不足时指定元素不缩小：父flex-row-start-start，指定子flex-1

7、水平布局自动换行：父flex-row-start-start和flow-wrap

总结：上面只是举例几个用法，相信聪明的你肯定看出了如何灵活组合其它的用法。结构flex-xx2-xx3-xx4中flex指定的是display: flex，xx2对应的是主轴方向属性flex-direction，xx3对应的是主轴对齐属性justify-content，xx4对应的是交叉轴对齐属性align-items。在配合几个两子属性和一个换行的父属性，不管是在移动端，还是各种浏览器端，只要支持css3属性的环境下基本能满足90%以上的布局需求。
最后附上源码：

/*  flex  */
[class*='flex'] {display: -webkit-flex;display: -ms-flexbox;display: flex;}
/*   finline 行内flex   */
[class*='finline'] {display: -webkit-inline-flex;display: -ms-inline-flexbox;display: inline-flex;}

/*   *-row   */
[class*='-row'] {-webkit-flex-direction: row;-ms-flex-direction: row;flex-direction: row;}
/*   *-rreverse 反横向   */
[class*='-rreverse'] {-webkit-flex-direction: row-reverse;-ms-flex-direction: row-reverse;flex-direction: row-reverse;}
/*   *-column   */
[class*='-column'] {-webkit-flex-direction: column;-ms-flex-direction: column;flex-direction: column;}
/*   *-creverse 反纵向   */
[class*='-creverse'] {-webkit-flex-direction: column-reverse;-ms-flex-direction: column-reverse;flex-direction: column-reverse;}

/*   *-*-start   */
[class*='row-start'],[class*='rreverse-start'],[class*='column-start'],[class*='creverse-start'] {-webkit-justify-content: flex-start;-ms-flex-pack: start;justify-content: flex-start;}
/*   *-*-end   */
[class*='row-end'],[class*='rreverse-end'],[class*='column-end'],[class*='creverse-end'] {-webkit-justify-content: flex-end;-ms-flex-pack: end;justify-content: flex-end;}
/*   *-*-center   */
[class*='row-center'],[class*='rreverse-center'],[class*='column-center'],[class*='creverse-center'] {-webkit-justify-content: center;-ms-flex-pack: center;justify-content: center;}
/*   *-*-between   */
[class*='row-between'],[class*='rreverse-between'],[class*='column-between'],[class*='creverse-between'] {-webkit-justify-content: space-between;-ms-flex-pack: justify;justify-content: space-between;}
/*   *-*-around   */
[class*='row-around'],[class*='rreverse-around'],[class*='column-around'],[class*='creverse-around'] {-webkit-justify-content: space-around;-ms-flex-pack: distribute;justify-content: space-around;}

/*   *-*-*-start   */
[class*='start-start'],[class*='center-start'],[class*='between-start'],[class*='around-start'],[class*='end-start'] {-webkit-align-items: flex-start;-ms-flex-align: start;align-items: flex-start;}
/*   *-*-*-end   */
[class*='start-end'],[class*='center-end'],[class*='between-end'],[class*='around-end'],[class*='end-end'] {-webkit-align-items: flex-end;-ms-flex-align: end;align-items: flex-end;}
/*   *-*-*-center   */
[class*='start-center'],[class*='center-center'],[class*='between-center'],[class*='around-center'],[class*='end-center'] {-webkit-align-items: center;-ms-flex-align: center;align-items: center;}
/*   *-*-*-baseline   */
[class*='start-baseline'],[class*='center-baseline'],[class*='between-baseline'],[class*='around-baseline'],[class*='end-baseline'] {-webkit-align-items: baseline;-ms-flex-align: baseline;align-items: baseline;}
/*    *-*-*-stretch    */
[class*='start-stretch'],[class*='center-stretch'],[class*='between-stretch'],[class*='around-stretch'],[class*='end-stretch'] {-webkit-align-items: stretch;-ms-flex-align: stretch;align-items: stretch;}
/* 父元素使用=>自动换行 */
.flow-wrap{flex-flow: wrap}
/* 子元素使用=> 铺满剩余空间 */
.flex-1{flex: 1}
/* 子元素使用=>空间不够不被压缩的元素 */
.shrink-0{flex-shrink: 0;}

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