css3中opacity属性学习与实践_css

css3中opacity属性是如何使用的呢：<length> inherit

length：由浮点数字和单位标识符组成的长度值0到1。不可为负值。默认值为：1 。

此标签的作用是声明一个元素的透明度，opacity取值为1的元素是完全不透明的，反之，取值为0是完全透明的，看不见的。1到0之间的任何值都表示该元素的透明程度。

兼容：Firefox 3.0.10 、Chrome 2.0.x、Opera 9.64、、Safari 4、Firefox 3.5

目前较老的Firefox版本，我们需要使用-moz-前缀，而对于旧的Safari/Chrome版本，我们需要使用-webkit-前缀。而对于更老的还在使用Khtml内核而不是webkit内核的Safari版本来说，我们需要使用-khtml-。那么如果我们想支持每一个浏览器，我们的代码应该是这样的： opacity: 0.5; -moz-opacity: 0.5; -webkit-opacity: 0.5; -khtml-opacity: 0.5;

对于IE不支持使用了一个滤镜：filter:alpha(opacity=50);IE我们需要使用从0到100的整数，IE8提供了一个新的方法来处：-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "<a href="https://www.gaodaima.com/go.html?url=http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt" rel="nofollow">http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt</a>; <html xmlns="<a href="https://www.gaodaima.com/go.html?url=http://www.w3.org/1999/xhtml"&gt" rel="nofollow">http://www.w3.org/1999/xhtml"&gt</a>; <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="utf-8" /> <meta name="robots" content="all" /> <meta name="author" content="Tencent-ISRD" /> <meta name="Copyright" content="Tencent" /> <style> img.opacity1 { opacity:0.25;} img.opacity2 { opacity:0.50;} img.opacity3 { opacity:0.75;} </style> <title>opacity</title> </head> <body> <div><img src=http://www.webskys.com/<a href="https://www.gaodaima.com/tag/css" title="查看更多关于css的文章" target="_blank">css</a>3/"<a href="http://www.webskys.com/skin/default/images/banner01.jpg&quot" rel="nofollow">http://www.webskys.com/skin/default/images/banner01.jpg&quot</a>; class="opacity1" alt="tencent" /></div> <div><img src=http://www.webskys.com/css3/"<a href="http://www.webskys.com/skin/default/images/banner01.jpg&quot" rel="nofollow">http://www.webskys.com/skin/default/images/banner01.jpg&quot</a>; class="opacity2" alt="tencent" /></div> <div><img src=http://www.webskys.com/css3/"<a href="http://www.webskys.com/skin/default/images/banner01.jpg&quot" rel="nofollow">http://www.webskys.com/skin/default/images/banner01.jpg&quot</a>; class="opacity3" alt="tencent" /></div> </body> </html> [/code]</p> <p><input type="button" value="运行代码"/></p> <p>欢迎大家阅读<span style='color:red;'>《css3中opacity属性学习与实践_css》</span>,跪求各位点评,若觉得好的话请收藏本文，by <strong>搞代码</strong></p> <hr /><div class="open-message">搞代码网（<a href="www.gaodaima.com" target="_blank" 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