FireFox下透明度設置的方法是：opacity=opacityValue;
opacityValue的取值範圍是【0.0~1.0】即0到1的小數
IE下透明度設置的方法是：filter:alpha(opacity=opacityValue);
opacityValue的取值範圍是【0~100】即0到100的整數
以下是firefox下的透明度設置例子
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>ffopacity.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<style type="text/css" media="all">
#p1{
opacity:0.2;
}
#p2{
opacity:0.4;
}
#p3{
opacity:0.6;
}
#p4{
opacity:0.8;
}
#p5{
opacity:1;
}
p{
width:200px;
height:100px;
background-color:green;
}
</style>
</head>
<body>
<p id="p1">opacity:0.2;不透明度爲20%</p>
<p id="p2">opacity:0.4;不透明度爲40%</p>
<p id="p3">opacity:0.6;不透明度爲60%</p>
<p id="p4">opacity:0.8;不透明度爲80%</p>
<p id="p5">opacity:1;不透明度爲100%</p>
<br/><br/>
<blockquote>IE不支持此屬性,請使用Firefox或者Opera瀏覽.</blockquote>
</body>
</html>
以下是IE下的透明度設置例子
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>ieopacity.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<style type="text/css" media="all">
#p1{
filter:alpha(opacity=20);
}
#p2{
filter:alpha(opacity=40);
}
#p3{
filter:alpha(opacity=60);
}
#p4{
filter:alpha(opacity=80);
}
#p5{
filter:alpha(opacity=100);
}
p{
width:300px;
height:100px;
background-color:green;
}
</style>
</head>
<body>
<p id="p1">filter:alpha(opacity=20);不透明度爲20</p>
<p id="p2">filter:alpha(opacity=40);不透明度爲40</p>
<p id="p3">filter:alpha(opacity=60);不透明度爲60</p>
<p id="p4">filter:alpha(opacity=80);不透明度爲80</p>
<p id="p5">filter:alpha(opacity=100);不透明度爲100</p>
<br/><br/>
<blockquote>IE下的屬性</blockquote>
</body>
</html>