JS。图片上传预览，兼容FF

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>imagePreview.html</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

    
    <script type="text/javascript" src="http://ayue05.blog.163.com/blog/jquery-1.7.2.min.js"></script>
    <script type="text/javascript" src="http://ayue05.blog.163.com/blog/imagePreview.js"></script>

   <script type="text/javascript">
   function preview(file,preview,imghead){
       if($.browser.msie){
                   //参数是否是IE，div的id，img的id，高,宽
           previewImage(true,file,preview,imghead,300,400);
   }else{
                   //参数是否是IE，div的id，img的id，高,宽
           previewImage(false,file,preview,imghead,300,400);
       }

   }
   </script>
</head>

<body>
<table>
<tr>
<td>添加圖片:</td>
       <td><input type="file" id="file" name="tip.uploadImage" value="文档上传" οnchange="preview(this,'preview','imghead')"/>
       <div>請上傳 202 pixel X 111 pixel 大小的圖片 </div>
       <div id="imagePreview" >图片预览
       <div id="preview">
        <img id="imghead" width=202 height=111 border=0 />
       </div>
       </div>
       </tr>
   </table>
</body>
</html>

IMGJS
function clacImgZoomParam( maxWidth, maxHeight, width, height ){
        var param = {top:0, left:0, width, height:height};
        if( width>maxWidth || height>maxHeight )
        {
            rateWidth = width / maxWidth;
            rateHeight = height / maxHeight;

            if( rateWidth > rateHeight )
            {
                param.width = maxWidth;
                param.height = Math.round(height / rateWidth);
            }else
            {
                param.width = Math.round(width / rateHeight);
                param.height = maxHeight;
            }
        }

        param.left = Math.round((maxWidth - param.width) / 2);
        param.top = Math.round((maxHeight - param.height) / 2);
        return param;
    }


    function previewImage(isIE,file,preview,imghead,width,height)
    {
    var MAXWIDTH = width;
    var MAXHEIGHT = height;
    var div = document.getElementById(preview);

    if(isIE){
       //IE预览使用滤镜??
                    // var docObj=document.getElementById(file);
                     var imgObjPreview=document.getElementById(imghead);
                        file.select();
                      // docObj.blur();
                        var imgSrc = document.selection.createRange().text;
                        var localImagId = document.getElementById(preview);
                        //必须设置高宽?
                        localImagId.style.width = width+"px";
                        localImagId.style.height = height+"px";
//                        //????????????????????????é???????¨??·??????????????????é? ??????
                        localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
                        localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
                        imgObjPreview.style.display = 'none';
                        document.selection.empty();

    }else if (file.files && file.files[0])
    {
        //其他浏览器
          div.innerHTML = '<img id='+imghead+'>';
          var img = document.getElementById(imghead);
          img.onload = function(){
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            img.width = width;
            img.height = height;

          }
          var reader = new FileReader();
          reader.onload = function(evt){img.src = evt.target.result;}
          reader.readAsDataURL(file.files[0]);
    }
    else
    {
        var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="http://ayue05.blog.163.com/blog/';
        file.select();
        var src = document.selection.createRange().text;
        div.innerHTML = '<img id='+imghead+'>';
        var img = document.getElementById(imghead);
        img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
        status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
        div.innerHTML = "<div id="divhead" style='"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;margin-left:"+rect.left+"px;"+sFilter+src+""'></div>";
    }

    }
IMGJS

jquery-1.7.2.min.js

jquery-1.7.2.min.js

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原文地址：https://www.cnblogs.com/wybshyy/p/13783810.html