IE浏览器PNG图片透明效果代码

 更新时间:2008年09月02日 15:43:06   作者:  
平常,我们经常使用Gif格式的图片以保持图片在浏览器中透明,以支持底色。但由于IE浏览器本身的原因,我们无法使透明的PNG图片透明起来。那么,如何将它在IE浏览器下变得透明呢?

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:

复制代码 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=\"" + "width:" + 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:
复制代码 代码如下:

<html>
<head>
<title>alpha image</title>
<style type="text/css">
.pngholder{
width:100px;
height:100px;
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://www.jb51.net/attachments/200510/03_124401_ie.png');
}
.pngalpha{
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);
background:url(https://www.jb51.net/attachments/200510/03_124401_ie.png) no-repeat;
width: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="https://www.jb51.net/attachments/200510/03_124401_ie.png"/>
</body>
</html>

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