场景：图片宽高未知，使其在固定宽高容器中垂直居中。
<style type="text/css"> .pic_box{ border:1px solid red; width: 300px; height: 300px; text-align: center; overflow: hidden; font-size: 0; } .pic_box::after{ content: ""; height: 100%; display: inline-block; vertical-align: middle; } img{ vertical-align: middle; } </style> <div class="pic_box"> <img src="img/sheep.png" /> </div>
非常简单：容器设置display:table，img外嵌套一层<span>或者<a>标签，设置display:table-cell，再用vertical-align:middle搞定。
<style type="text/css"> .pic_box{ display: table; border:1px solid red; width: 308px; height: 308px; overflow: hidden; text-align: center; } .pic_box a{ display: table-cell; vertical-align: middle; width: 300px; height: 300px; } </style> <div class="pic_box"> <a href="#"> <img src="img/sheep.png" /> </a> </div>
兼容性写法：
HTML代码： <div class=”demo”><a href=“#”><img src=“images/01.jpg” /></a></div> CSS代码： /*For Firefox Chrome*/ .demo{border:1px #ddd solid;width:208px;height:148px;overflow:hidden;text-align:center;display:table;float:left;margin:50px;position:relative;} .demo a{display:table-cell;vertical-align:middle;width:200px;height:140px;} .demo a img{border:1px #ddd solid;margin:0 auto;max-width:200px;max-height:140px;} /*For IE7*/ *+html .demo a{position:absolute;top:50%;width:100%;text-align:center;height:auto;} *+html .demo a img{position:relative;top:-50%;left:-50%;} /*For IE6*/ *html .demo a{position:absolute;top:51%;width:100%;text-align:center;height:auto;display:block;} *html .demo a img{position:relative;top:-50%;left:-50%;width:expression(this.width>200?“200px”:“auto”);height:expression(this.height>140?“140px”:“auto”);}
资源链接
http://stylechen.com/img-middle.html
http://www.daqianduan.com/2733.html
http://www.zhangxinxu.com/wordpress/2009/08/%E5%A4%A7%E5%B0%8F%E4%B8%8D%E5%9B%BA%E5%AE%9A%E7%9A%84%E5%9B%BE%E7%89%87%E3%80%81%E5%A4%9A%E8%A1%8C%E6%96%87%E5%AD%97%E7%9A%84%E6%B0%B4%E5%B9%B3%E5%9E%82%E7%9B%B4%E5%B1%85%E4%B8%AD/
原文：http://www.cnblogs.com/starof/p/4745577.html
