简易上传图片插件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
    <title></title>
    <script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
    <script>
      //图片上传预览    IE是用了滤镜。
        function previewImage(file)
        {
          var MAXWIDTH  = 90; 
          var MAXHEIGHT = 90;
          var div = document.getElementById('preview');
          if (file.files && file.files[0])
          {
              div.innerHTML ='<img id=imghead onclick=$("#previewImg").click()>';
              var img = document.getElementById('imghead');
              img.onload = function(){
                var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
                img.width  =  rect.width;
                img.height =  rect.height;
//                 img.style.marginLeft = rect.left+'px';
                img.style.marginTop = rect.top+'px';
              }
              var reader = new FileReader();
              reader.onload = function(evt){img.src = evt.target.result;}
              reader.readAsDataURL(file.files[0]);
          }
          else //兼容IE
          {
            var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
            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='width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;"+sFilter+src+"\"'></div>";
          }
        }
        function clacImgZoomParam( maxWidth, maxHeight, width, height ){
            var param = {top:0, left:0, width: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;
        }
    </script>
</head>
<body>
<div id="addCommodityIndex">
       <!--input-group start-->
      <div class="input-group row">
          <div class="col-sm-3">
              <label>商品图片</label>
          </div>
          <div class="col-sm-9 big-photo">
          	<div id="preview">
                  <!-- <img id="imghead" border="0" src="img/photo_icon.png" width="90" height="90" onclick="$('#previewImg').click();"> -->

                  <button id="imghead" style="text-align: center; width:72px;height:26px;" onclick="$('#previewImg').click();">上传图片</button>
               </div>         
              <input type="file" onchange="previewImage(this)" style="display: none;" id="previewImg">
          	<!--<input id="uploaderInput" class="uploader__input" style="display: none;" type="file" accept="" multiple="">-->
          </div>
      </div>
      <!--input-group end-->
       
</div>

</body>
</html>
效果预览：
简易上传图片插件

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