上次简要的说了一些css3中flex的相关概念(详细: css学习16:css3 flex流动自适应响应式布局设计 ),这次继续说下css3的flex,简单的举几个实例。
一、图片自适应居中
实例图:
实例HTML:
<div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/100x100" class="lazy" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/200x100" class="lazy" class="" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/100x200" class="lazy" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/200x200" class="lazy" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/50x50" class="lazy" alt=""></div>
实例CSS:
.demo{ width: 100px; height: 100px; border: 2px solid #ddd; background: #f5f5f5; padding: 6px; float: left; margin-left: 20px; /*flex布局(作用于容器)*/ display: flex; /*水平居中(作用于容器)*/ justify-content: center; /*垂直居中(作用于容器)*/ align-items: center;}.demo img{ max-width: 100px; max-height: 100px; width: auto; height: auto;}
demo: http://demo.qianduanblog.com/2799/1.html
二、水平响应式列表
实例图:
实例HTML:
<div class="demo-wrap"> <div class="demo"> <div class="item item1">高120px</div> <div class="item item2">高50px</div> <div class="item item3">高140px</div> <div class="item item4">高100px</div> </div></div>
实例CSS:
.demo-wrap{ border: 2px solid #ddd; background: #f5f5f5; padding: 6px;}.demo{ width: 100%; /*flex布局(作用于容器)*/ display: flex; /*两端对齐(作用于容器)*/ justify-content: space-between;}.demo .item{ width: 100px; background: #ffd; color: #C90000; font-size: 20px; text-align: center; line-height: 50px;}.demo .item1{ height: 120px;}.demo .item2{ height: 50px;}.demo .item3{ height: 140px;}.demo .item4{ height: 100px;}
demo: http://demo.qianduanblog.com/2799/2.html
三、水平响应式列表底端对齐
和上个例子差不多,只是增加了底端对齐的的特性。
只是修改了容器的样式:
.demo{ width: 100%; /*flex布局(作用于容器)*/ display: flex; /*两端对齐(作用于容器)*/ justify-content: space-around; /*侧轴方向对齐方式(作用于容器)*/ align-items: flex-end;}
demo: http://demo.qianduanblog.com/2799/3.html
四、多行响应式布局
宽屏:
中屏:
窄屏:
HTML代码:
<div class="demo-wrap"> <div class="demo"> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> </div></div>
CSS代码:
.demo-wrap{ border: 2px solid #ddd; background: #f5f5f5; padding: 6px;}.demo{ width: 100%; /*flex布局(作用于容器)*/ display: flex; /*两端对齐(作用于容器)*/ justify-content: space-around; /*侧轴方向对齐方式(作用于容器)*/ align-items: flex-end; /*换行(作用于容器)*/ flex-wrap: wrap;}.demo .item{ width: 300px; height: 50px; background: #444; margin-bottom: 20px;}
demo: http://demo.qianduanblog.com/2799/4.html
五、左固定右自适应等高布局
演示截图:
HTML:
<div class="demo"> <div class="left">左边固定宽度为100px,这里设置了高度为auto</div> <div class="right">右边宽度自适应,并且左右两个区域是等高的,这里设置了高度为200px</div></div>
CSS:
.demo{ /*flex布局(作用于容器)*/ display: flex; /*项目拉伸对齐,也就是所左边的高度为拉伸到和右边等高,默认是拉伸的*/ /*align-items: stretch;*/}.demo .left{ /*左边固定宽度,必须设置其最小宽度和最大宽度*/ width: 100px; min-width: 100px; max-width: 100px; /*高度自由分配*/ height: auto; background: #B4D3F7; /*空白区域分配比例为0(作用于项目)*/ flex-grow: 0;}.demo .right{ margin-left: 10px; width: auto; height: 200px; background: #F7E8B4; /*空白区域分配比例为1(作用于项目) 左右得到的空白比例为0:1,所以右边会分配到剩余的所有空白区域, 左边成固定的宽度,右边为自适应宽度*/ flex-grow: 1;}
demo: http://demo.qianduanblog.com/2799/5.html
六、左右固定中间自适应宽度底部对齐布局
上面的例子是左右布局的,相比较而言,双栏布局会做了,那么三栏布局也就不是问题了。先看实例图:
HTML:
<div class="demo"> <div class="left">左边固定宽度为100px,这里设置了高度为auto</div> <div class="center">中间宽度自适应,并且左中右两个区域是等高的,这里设置了高度为200px</div> <div class="right">右边固定宽度为150px,这里设置了高度为auto</div></div>
CSS:
.demo{ /*flex布局(作用于容器)*/ display: flex; /*项目拉伸对齐,也就是所左边的高度为拉伸到和右边底部对齐*/ align-items: flex-end;}.demo .left{ /*左边固定宽度,必须设置其最小宽度和最大宽度*/ width: 100px; min-width: 100px; max-width: 100px; /*高度自由分配*/ height: auto; background: #B4D3F7; /*空白区域分配比例为0(作用于项目)*/ flex-grow: 0;}.demo .center{ margin: 0 10px; width: auto; height: 200px; background: #F7E8B4; /*空白区域分配比例为1(作用于项目) 左右得到的空白比例为0:1,所以右边会分配到剩余的所有空白区域, 左边成固定的宽度,右边为自适应宽度*/ flex-grow: 1;}.demo .right{ /*右边固定宽度,必须设置其最小宽度和最大宽度*/ width: 150px; min-width: 150px; max-width: 150px; /*高度自由分配*/ height: auto; background: #CBFFD2; /*空白区域分配比例为0(作用于项目)*/ flex-grow: 0;}
demo: http://demo.qianduanblog.com/2799/6.html

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