CSS如何设置div背景透明度且兼容性良好:
建议:尽可能的手写代码，可以有效的提高学习效率和深度。
设置对象的透明度在很多网页特效中都有实用，设置对象的透明度并不难，唯一的难点可能就是如何兼容各大主流浏览器，下面就简单介绍一下如何实现此效果。代码实例如下:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title> <style type="text/css"> *{ margin:0px; padding:0px; } .opacity{ width:150px; height:150px; background-color:green; filter:alpha(opacity=50); -moz-opacity:0.5; opacity:0.5; margin-left:20px; margin-top:20px; } span{ display:block; width:80px; height:80px; } </style> </head> <body> <div class="opacity"> <span>蚂蚁部落</span> </div> </body> </html> 上面的代码实现了各个浏览器的兼容。起透明效果的代码如下:
filter:alpha(opacity=50); -moz-opacity:0.5; opacity:0.5;
第一行代码仅能在IE浏览器中有效。
第二行代码支持老版本的FF浏览器，其实去掉也可以，因为老版本的浏览器使用率很少了。
第三行能够支持各大浏览器，但是IE6-IE8浏览器不支持。
特别说明:
虽然实现了背景透明，但div中的文字也呈现为透明状态，这往往不是想要的，可以参阅如何设置div的透明度但是其中的文字不透明一章节解决此问题。
原文地址:http://www.softwhy.com/forum.php?mod=viewthread&tid=4680
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