本文主要介绍了CSS未知高度垂直居中的实现，分享给大家，具体如下：
<!doctype html><html lang="en"> <head> <meta charset="utf-8" /> <meta content="IE=8" http-equiv="X-UA-Compatible"/> <title> CSS垂直居中</title> <style type="text/css"> .container{ width:500px;/*装饰*/ height:500px; background:#B9D6FF; border: 1px solid #CCC; } </style> </head> <body> <h1>垂直居中（table）</h1> <div class=container> <table width="100%" height="100%"> <tr> <td align="center" valign="middle"> <img src="http://images.cnblogs.com/cnblogs_com/rubylouvre/205314/r_iebug.jpg" /> </td> </tr> </table> </div> </body> </html> 好了，我们看其CSS实现。凡是table能做到的，CSS都能做的，但各浏览器在CSS的差异比较大，因此要兼容它们难度很大。这涉及许多细节，各种流啊，display的表现效果与CSS hack，IE早些年搞了大堆的私有属性，这也有待我们深一步挖掘。我们先看最简单的实现，背景图片法
背景图片法
<!doctype html><html><head><title> CSS垂直居中</title><style type="text/css">.container { width:500px; height:500px; line-height:500px; background:#B9D6FF url(http://images.cnblogs.com/cnblogs_com/rubylouvre/205314/r_iebug.jpg) no-repeat center center; border:1px solid #f00; text-align: center;} </style> </head><body><h1>垂直居中</h1><div class="container"> </div></body></html>CSS表达式法
<html lang="en"> <head> <meta charset="utf-8" /> <meta content="IE=8" http-equiv="X-UA-Compatible"/> <title>司徒正美 CSS垂直居中</title> <style type="text/css"> .container{ /*IE8与标准游览器垂直对齐*/ display: table-cell; vertical-align:middle; width:500px;/*装饰*/ height:500px; background:#B9D6FF; border: 1px solid #CCC; } .container img{ display:block;/*让其具备盒子模型*/ margin:0 auto; text-align:center; margin-top:expression((500 - this.height )/2);/*让IE567垂直对齐 */ } </style> </head> <body> <h1>垂直居中（CSS表达式）</h1> <div class="container"> <img src="http://images.cnblogs.com/cnblogs_com/rubylouvre/205314/r_iebug.jpg" /> </div> </body> </html> 绝对定位法
<!doctype html><html lang="en"> <head> <meta charset="utf-8" /> <meta content="IE=8" http-equiv="X-UA-Compatible"/> <title>司徒正美 CSS垂直居中</title> <style type="text/css"> div { /*IE8与标准游览器垂直对齐*/ display:table-cell; vertical-align:middle; overflow:hidden; position:relative; text-align:center; width:500px;/*装饰*/ height:500px; border:1px solid #ccc; background:#B9D6FF; } div p { +position:absolute; top:50% } img { +position:relative; top:-50%; left:-50%; } </style> </head> <body> <h1>垂直居中(绝对定位)</h1> <div class="container"> <p> <img src="http://images.cnblogs.com/cnblogs_com/rubylouvre/205314/r_iebug.jpg" /> </p> </div> </body></html>display:inline-block法
<!doctype html><html lang="en"> <head> <meta charset="utf-8" /> <meta content="IE=8" http-equiv="X-UA-Compatible"/> <title>司徒正美 CSS垂直居中</title> <style type="text/css"> div { display:table-cell; vertical-align:middle; text-align:center; width:500px; height:500px; background:#B9D6FF; border: 1px solid #CCC; } </style> <!--[if IE]><style type="text/css">i { display:inline-block; height:100%; vertical-align:middle }img { vertical-align:middle }</style><![endif]--> </head> <body> <h1>垂直居中(inline-block法)</h1> <div class="container"> <i></i> <img src="http://images.cnblogs.com/cnblogs_com/rubylouvre/205314/r_iebug.jpg" /> </div> </body></html>writing-mode法
<!doctype html><html lang="en"> <head> <meta charset="utf-8" /> <meta content="IE=8" http-equiv="X-UA-Compatible"/> <title> CSS垂直居中</title> <style type="text/css"> div{ width:500px; height:500px; line-height:500px; text-align:center; background:#B9D6FF; border:1px solid #f00; } div span{ height:100%9; writing-mode:tb-rl9; } div img{ vertical-align:middle } </style> </head> <body> <h1>垂直居中(writing-mode法)</h1> <div class="container"> <span> <img src="http://images.cnblogs.com/cnblogs_com/rubylouvre/205314/r_iebug.jpg" /> </span> </div> </body></html>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
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