IE下png实现透明

  
  

   
   
   
   <
   
   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>