<script type="text/javascript">         function setImagePreview(docObj,localImagId,imgObjPreview)         {             if(docObj.files && docObj.files[0])             {                 //火狐下，直接设img属性                 imgObjPreview.style.display = 'block';                 imgObjPreview.style.width = '300px';                 imgObjPreview.style.height = '200px';                                    //火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式                  imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);             }             else             {                 //IE下，使用滤镜                 docObj.select();                 var imgSrc = document.selection.createRange().text;                 //必须设置初始大小                 localImagId.style.width = "300px";                 localImagId.style.height = "200px";                 //图片异常的捕捉，防止用户修改后缀来伪造图片                 try                 {                     localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";                     localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;                  }                  catch(e)                  {                     alert("您上传的图片格式不正确，请重新选择!");                     return false;                   }                                            imgObjPreview.style.display = 'none';                   document.selection.empty();             }             return true;         } </script>

<div id="localImag"  style="width: 300px; height: 200px">    <img id="preview" alt="预览图片" src="http://www.1sucai.cn/images/logo.gif" width="300px" height="200px" /> </div>    <asp:FileUpload ID="PicLoad" Width="300px" runat="server" onchange="javascript:setImagePreview(this,localImag,preview);">    </asp:FileUpload>