javascript 設置背景透明效果代碼

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關鍵字 網頁製作 Ajax JavaScript

javascript教程 設置背景透明效果代碼


<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "HTTP://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">


<html xmlns="HTTP://www.jzread.com/1999/xhtml">


<head>


<meta HTTP-equiv="Content-Type" content="text/html; charset=gb2312" />


<title>javascript 設置背景透明效果代碼</title>


<script language="javascript">


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.css教程Text;


   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;


  }


 }


}


function AlphaBackgrounds(){


 var rslt = navigator.appVersion.match(/MSIE (d+.d+)/, '');


 var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5);


 for (i=0; i<document.all.length; i++){


  var bg = document.all[i].currentStyle.backgroundImage;


  if (bg){


   if (bg.match(/.png/i) != null){


    var mypng = bg.substring(5,bg.length-2);


    //alert(mypng);


    document.all[i].style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+mypng+"', sizingMethod='crop')";


    document.all[i].style.backgroundImage = "url('')";


alert(document.all[i].style.filter);


   }                                              


  }


 }


}


if (navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer" && window.at tachEvent) {


 window.attachEvent("onload", correctPNG);


 window.attachEvent("onload", AlphaBackgrounds);


}


 


</script>


</head>

<body>
</body>
</html>

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