IE浏览器下读取客户端上传的文件大小

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>文件大小判断</title>
 </head>
 <body>
 限制：<input type="text" size="4" value="10" name="fileSizeLimit" id="fileSizeLimit"/> K
 <input type="file" name="file1" id="file1" size="40" onchange="changeSrc(this)"/>
 <br>
 <img id="fileChecker" />   

 <script type="text/javascript">
 var oFileChecker = document.getElementById("fileChecker");  

 function changeSrc(filePicker)
 {
     oFileChecker.src = filePicker.value;
 }  

 oFileChecker.onreadystatechange = function ()
 {
     if (oFileChecker.readyState == "complete")
     {
         checkSize();
     }
 }  

 function checkSize()
 {
     var limit  = document.getElementById("fileSizeLimit").value * 1024;  

     if (oFileChecker.fileSize > limit)
     {
         alert("文件大小超出限制!");
     }
     else
     {
         alert("文件大小符合要求.");
     }
 }
 </script>
 </body>
 </html>