Author 王平安
E-mail pingan8787@qq.com
博 客 www.pingan8787.com
微 信 pingan8787
每日文章 https://0x9.me/KMrv3

demo1

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>背景透明，文字不透明</title>
<style>
*{
    padding: 0;
    margin: 0;
}

body{
  padding: 50px;
  background: url(img/bg.png) 0 0 repeat;
}

.demo{
  padding: 25px;
  background-color: rgba(0,0,0,0.5);/* IE9、标准浏览器、IE6和部分IE7内核的浏览器(如QQ浏览器)会读懂 */
}
.demo p{
  color: #FFFFFF;
}
@media \0screen\,screen\9 {/* 只支持IE6、7、8 */
  .demo{
    background-color:#000000;
    filter:Alpha(opacity=50);
    position:static; /* IE6、7、8只能设置position:static(默认属性) ，否则会导致子元素继承Alpha值 */
    *zoom:1; /* 激活IE6、7的haslayout属性，让它读懂Alpha */
  }
  .demo p{
    position: relative;/* 设置子元素为相对定位，可让子元素不继承Alpha值 */
  }  
}

</style>
</head>
<body>    

<div class="demo">
    <p>背景透明，文字不透明</p>
</div>

</html>

demo2

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>opacity</title>
<style>
*{
    padding: 0;
    margin: 0;
}
body{
    padding: 50px;
    background: url(http://static.cnblogs.com/images/logo_small.gif) 0 0 repeat;
}
 
.demo{
    width: 200px;
    height: 200px;
    position: relative;
}
.demo-bg{
    position: absolute;
    left: 0;
    top: 0;
    z-index: 0;
    width: 200px;
    height: 200px;
    background-color:#000000;
    filter:Alpha(opacity=50);
    background-color: rgba(0,0,0,0.5);
}
.demo-txt{
    position: relative;
    z-index: 1;
    color: #FFFFFF;
}
</style>
</head>
<body>   
 
<div class="demo">
    <div class="demo-bg"></div><!-- 透明背景 -->
    <div class="demo-txt">测测</div><!-- 不透明文字 -->
</div>
 
</html>