如何使PNG图片在IE浏览器实现透明效果

首先看我们的<img>标签代码：<img src="Example.png" border="0" alt="放大镜" />我们将利用IE中特有的特效来满足这个要求，这就是AlphaImageLoader Filter (http://msdn.microsoft.com/library/default.asp?url=/workshop/author/filter/reference/filters/alphaimageloader.asp) 如何做？将下面代码保存为correctPNG.js:

代码如下:

function correctPNG() 
{ 
for(var i=0; i<document.images.length; i++) 
{ 
var img = document.images[i] 
var imgName = img.src.toUpperCase() 
if (imgName.substring(imgName.length-3, imgName.length) == "PNG") 
{ 
var imgID = (img.id) ? "id='" + img.id + "' " : "" 
var imgClass = (img.className) ? "class='" + img.className + "' " : "" 
var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' " 
var imgStyle = "display:inline-block;" + img.style.cssText 
if (img.align == "left") imgStyle = "float:left;" + imgStyle 
if (img.align == "right") imgStyle = "float:right;" + imgStyle 
if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle 
var strNewHTML = "<span " + imgID + imgClass + imgTitle 
+ " style=\"" + "" + img.width + "px; margin:6px; height:" + img.height + "px;" + imgStyle + ";" 
+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader" 
+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
img.outerHTML = strNewHTML 
i = i-1 
} 
} 
} 
window.attachEvent("onload", correctPNG); 

然后在你需要透明的网页中的<head>....</head>区加入：<script type="text/javascript" src="correctPNG.js"></script>

在<body>区加入多个与<img src="Example.png" border="0" alt="放大镜" />类似的PNG图片，试试看？
另一种方法：

代码如下:

<html>
<head>
<title>alpha image</title>
<style type="text/css">
.pngholder{
100px;
height:100px;
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://www.jb51.net/attachments/200510/03_124401_ie.png');
}
.pngalpha{
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);
background:url(http://www.jb51.net/attachments/200510/03_124401_ie.png) no-repeat;
100px;
height:100px;
}
</style>
</head>
<body bgcolor="#3399ff#">
<!- And this is your code to implement the image ->
<div>透明</div>
<div class="pngholder"><div class="pngalpha"></div></div>
<div>不透明</div>
<img src="http://www.jb51.net/attachments/200510/03_124401_ie.png"/>
</body>
</html>