图片上传并显示（兼容ie），图片大小判断

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一、上传并显示<br><br>HTML <div id="swf" style="margin: 0 auto;text-align: center;">     <img src="/assets/img/default.jpg" height="180px" width="180px"          id="logoshow"> </div> <div id="headview" style="text-align: center;margin: 0 auto;">     <input type="file" id="logo" name="logo" style="width: 180px;"            onchange="previewImage(this)"> </div>   JS function previewImage(file){     var div = document.getElementById('swf');     if (file.files && file.files[0]) {//HTML5         var img = document.getElementById('logoshow');         var reader = new FileReader();         reader.readAsDataURL(file.files[0]);         reader.onload = function (evt) {             img.src = evt.target.result;             img.style.width= "180px";         };     }     else //兼容IE，滤镜     {         alert("filter");         var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';         file.select();         file.blur();         var src = document.selection.createRange().text;         var img = document.getElementById('logoshow');         img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;         div.innerHTML = "<img id=logoshow style='margin:0px auto;width:180px;height:180px;" + sFilter + src + "\"'>";     } }

　　

二、判断大小，IE10才有file功能

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JS判断文件大小 <input id="file" type="file" onchange="filefujianChange(document.getElementById('file'))">   <script type="text/javascript">     function filefujianChange(target) {         var fileSize = 0;                 if (!target.files) {                 var filePath = target.value;                 var fileSystem = new ActiveXObject("Scripting.FileSystemObject");                    var file = fileSystem.GetFile (filePath);                 fileSize = file.Size;            } else {                fileSize = target.files[0].size;             }           var size = fileSize / 1024;         alert(size);            if(size>2000){              alert("附件不能大于2M");             target.value="";             return         }         var name=target.value;         var fileName = name.substring(name.lastIndexOf(".")+1).toLowerCase();         alert(fileName);         if(fileName !="jpg" && fileName !="jpeg" && fileName !="pdf" && fileName !="png" && fileName !="dwg" && fileName !="gif" ){             alert("请选择图片格式文件上传(jpg,png,gif,dwg,pdf,gif等)！");             target.value="";             return ;         }     } </script>