背景半透明文字不透明效果。（兼容IE，FF）

IE：外层filter，内层position:relative或absolute。
FF：外层不使用opacity，而用background:rgba()。

 

<html>
<head>
    <style>
        #wrapper
        {
            background: #369;
            width:300px;
            height:150px;
        }
        #div1
        {
            -moz-opacity: 0.3; /* FF 3.5以下 */
            opacity: 0.3; /* FF 3.5及以上 */
            filter: alpha(opacity=30); /* IE6及以上 */
            background: #fff;
            width: 200px;
            height: 50px;
        }
        #div2
        {
            background: rgba(255, 255, 255, 0.3) !important; /* IE无效，FF有效 */
            background: #fff;
            filter: alpha(opacity=30);
            width: 200px;
            height: 50px;
        }
        #div2 span
        {
            position: relative;
        }
    </style>
</head>
<body>
    <div id="wrapper">
        <div id="div1">
            <span>图层背景半透明，字体颜色也半透明</span>
        </div>
        <br />
        <div id="div2">
            <span>图层背景半透明，字体颜色不半透明</span>
        </div>
    </div>
</body>
</html>

 

以下是rgba属性的浏览器支持情况，来源：http://css-tricks.com/rgba-browser-support/

 

posted @ 2011-03-08 15:34  martian  阅读(1905)  评论(1)    收藏  举报