CSS如何设置div半透明效果:
设置元素的透明度在很多应用中都有使用，下面就介绍一下如何设置一个元素为半透明，其他的透明效果自己衍伸就可以了。
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">div{ filter:alpha(opacity=50); opacity:0.5; width:100px; height:100px; background-color:green;} </style></head><body><div></div></body></html>
opacity属性所以标准浏览器都支持，但是IE8和IE8以下浏览器不支持此属性，于是就使用filter:alpha(opacity=50)进行兼容，opacity的取值是0-1,但是filter下的那个取值是0-100。opacity属性可以参阅CSS的opacity属性一章节。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=9651
更多内容可以参阅:http://www.softwhy.com/divcss/
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