PNG图片 兼容IE FF 等浏览器的代码写法

一 PNG透明背景CSS写法

.png
{
background:url(http://www.028wz.net/img/logo.png) left top no-repeat !important; /*For Firefox*/
*background:none;/*For IE7 & IE6*/
_filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://www.028wz.net/img/logo.png',sizingMethod='crop');/*For IE6*/
}

二 PNG 透明图片

这里插入一个JS

<script>
// JavaScript Document
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
          }
       }
    }    
}
if(window.attachEvent){
 window.attachEvent("onload", correctPNG);
}else if(window.addEventListener){
 window.addEventListener("load",correctPNG,true);
}else{
 window["onload"]=correctPNG;
}
</script>
<img src="http://www.028wz.net/img/logo.png">