实例：解决IE6下png透明失效的问题。
实例：解决IE6下png透明失效的问题。
CSS样式:
.png{
_background: url(http://www.snowangel.cn/images/angel.png) no-repeat !important;
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=noscale, src="http://www.snowangel.cn/images/angel.png");
background:none;
width:118px;height:133px;
}
.png div{position:relative;}
HTML代码：
<div class="png">
<div>
CSS 背景PNG透明 及 链接失效问题解决
</div>
</div>
/*
兼容IE6.0、IE7.0、FF，
IE7.0和新版的FF其实是可以不加filter滤镜直接透明的。
*/
第 1 种方法:定义一个样式,给某个div应用这个样式后，div的透明png背景图片自动透明了。（注意两处图片的路径写法不一样，本例中， icon_home.png图片与html文件在相同目录）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
<!--
.qq {
height: 90px;
width: 90px;
background-image: url(icon_home.png)!important;/* FF IE7 */
background-repeat: no-repeat;
_filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='icon_home.png'); /* IE6 */
_ background-image: none; /* IE6 */
}
-->
</style>
</head>
<body>
<div class="qq"></div>
</body>
</html>
第 2 种方法: 给img定义样式，页面上所有透明png即自动透明了。（这方法只对直接插入的图片有效，对背景图无效）注意，要准备一个透明的小图片transparent.gif,大小不限。必须放在和html相同的目录
请勿大量使用，否则会导致页面打开很慢!!!)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
.mypng img {
azimuth: expression(
this.pngSet?this.pngSet=true:(this.nodeName == "IMG" && this.src.toLowerCase().indexOf('.png')>-1?(this.runtimeStyle.backgroundImage = "none",
this.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.src + "', sizingMethod='image')",
this.src = "transparent.gif"):(this.origBg = this.origBg? this.origBg :this.currentStyle.backgroundImage.toString().replace('url("','').replace('")',''),
this.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.origBg + "', sizingMethod='crop')",
this.runtimeStyle.backgroundImage = "none")),this.pngSet=true);
}
</style>
</head>
<body>
换成你的png图片
<div class="mypng">
<img src="icon_face_07.png" width="30" height="30" />
<img src="icon_face_10.png" width="30" height="30" />
<img src="icon_face_08.png" width="30" height="30" />
</div>
</body>
</html>
第 3 种方法:用JS实现,加上一段js代码后,所有插入的透明png自动透明了.（注意，这方法也是只对直接插入的图片有效，对背景图无效）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script language="JavaScript">
function correctPNG() // correctly handle PNG transparency in Win IE 5.5 & 6.
{
var arVersion = navigator.appVersion.split("MSIE")
var version = parseFloat(arVersion[1])
if ((version >= 5.5) && (document.body.filters))
{
for(var j=0; j<document.images.length; j++)
{
var img = document.images[j]
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; height:" + img.height + "px;" + imgStyle + ";"
+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
img.outerHTML = strNewHTML
j = j-1
}
}
}
}
window.attachEvent("onload", correctPNG);
</script>
<style type="text/css">
<!--
body {
background-color: #9999CC;
}
-->
</style></head>
<body>
把图片换成你自己的图片
<img src="img/icon_face_03.png" width="30" height="30" /><!--把图片换成你自己的图片 -->
<img src="img/icon_face_05.png" width="30" height="30" />
<img src="img/menu_title_over.png" width="130" height="36" />
</body>
</html>
方法四
<script language="javascript">
// 修复 IE 下 PNG 图片不能透明显示的问题
function fixPNG(myImage) {
var arVersion = navigator.appVersion.split("MSIE");
var version = parseFloat(arVersion[1]);
if ((version >= 5.5) && (version < 7) && (document.body.filters))
{
var imgID = (myImage.id) ? "id='" + myImage.id + "' " : "";
var imgClass = (myImage.className) ? "class='" + myImage.className + "' " : "";
var imgTitle = (myImage.title) ? "title='" + myImage.title + "' " : "title='" + myImage.alt + "' ";
var imgStyle = "display:inline-block;" + myImage.style.cssText;
var strNewHTML = "<span " + imgID + imgClass + imgTitle
+ " style=\"" + "width:" + myImage.width
+ "px; height:" + myImage.height
+ "px;" + imgStyle + ";"
+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
+ "(src=\'" + myImage.src + "\', sizingMethod='scale');\"></span>";
myImage.outerHTML = strNewHTML;
} }
window.onload=function(){
document.getElementById("top").style.height=screen.height/5+"px";
}//
</script>
用法如下：
<img src="logo.png" width="328" height="325" border="0" onload="fixPNG(this)" />