PNG透明兼容IE6的几种方法

方法一：css方式，写一个属性hack，使用滤镜来解决png在ie6下不兼容的问题。

_filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=’icon_home.png’); /* IE6 */
_ background-image: none; /* IE6 */

方法二：js

<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=”" + “” + 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>

方法三：插件

<!–[if lte IE 6]>
<style>.png{behavior:url(“jscss/iepngfix.htc”);}</style> //在这里可以加入其他用到png图片的id或者class
<script type=”text/javascript” src=”jscss/iepngfix_tilebg.js”></script>
<![endif]–>

另外，http://www.cnblogs.com/bky250214511/archive/2010/02/22/1671197.html 有详细介绍。