如何用PS去掉PNG图片的背景色？

需要一段js代码来辅助它
首先在你网页的同级目录建立一个pngfix.js的文件。然后把以下代码复制进去

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; 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PEN所在的HTML内加入
<script type="text/javascript" src="pngfix.js"></script>