JS打开图片另存为对话框

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”>
<html>
<head>
<title> New Document </title>
<script src=”http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js” type=”text/javascript”></script>

<script language=”JavaScript”>
<!–
function downLoadImage(imagePathURL){

//如果中间IFRAME不存在,则添加
if(!document.getElementById(“_SAVEASIMAGE_TEMP_FRAME”))
jQuery(‘<iframe style=”display:none;” id=”_SAVEASIMAGE_TEMP_FRAME” name=”_SAVEASIMAGE_TEMP_FRAME” onload=”_doSaveAsImage();”
width=”0″ height=”0″ src=”about:blank”></iframe>’).appendTo(“body”);

if(document.all._SAVEASIMAGE_TEMP_FRAME.src!=imagePathURL){
//图片地址发生变化,加载图片
document.all._SAVEASIMAGE_TEMP_FRAME.src = imagePathURL;
}else{
//图片地址没有变化,直接另存为
_doSaveAsImage();
}
}
function _doSaveAsImage(){
if(document.all._SAVEASIMAGE_TEMP_FRAME.src!=”about:blank”)
document.frames(“_SAVEASIMAGE_TEMP_FRAME”).document.execCommand(“SaveAs”);
}

//–>
</script>

</head>

<body>
<input type=”button” value=”download image” onclick=”downLoadImage(‘http://www.blogjava.net/images/blogjava_net/weiwei/46570/r_beyond1991.jpg’);”>
</body>
</html>

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