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(转)解决ie6下png图片不透明方法

    博客分类：
  • web
ie6pngjavascript 
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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) && (version < 7) && (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)" />

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