CSS 图像透明/不透明opacity
创建透明对象，设置悬停效果
img
{opacity:0.4;
filter:alpha(opacity=40); /* 适用 IE8 及其更早版本 */
}
img:hover
{
opacity:1.0;
filter:alpha(opacity=100); /* 适用 IE8 及其更早版本 */
}
</style>
</head>
<body>
<h1>图片透明度</h1>
<img src="klematis.jpg" width="150" height="113" alt="klematis">
<img src="/images/klematis2.jpg" width="150" height="113" alt="klematis">
创建一个具有文本拥有背景图像的透明框
div.background
{
width: 500px;
height: 330px;
background: url(klematis.jpg) repeat;
border: 2px solid black;
}
div.transbox
{
width: 400px;
height: 240px;
margin: 30px 50px;
background-color: #ffffff;
border: 1px solid black;
opacity:0.6;
filter:alpha(opacity=60); /* For IE8 and earlier */
}
div.transbox p
{
margin: 30px 40px;
font-weight: bold;
color: #000000;
}
</style>
</head>
<body><div class="background">
<div class="transbox">
<p>This is some text that is placed in the transparent box.
This is some text that is placed in the transparent box.
This is some text that is placed in the transparent box.
This is some text that is placed in the transparent box.
This is some text that is placed in the transparent box.
</p>