上传.html

<!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta name="Generator" content="EditPlus®">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>Document</title>
 </head>
 <script type="text/javascript">    
function getFileSize(fileObj)    
{    
        //不能使用new Image，ie下报无dynsrc属性  
    var img1 = document.getElementById('img1');  
    img1.dynsrc=fileObj.value;  
        //img1.fileSize：IE ， fileObj.files[0].fileSize：chrome， fileObj.files[0].size：FF  
    var size = img1.fileSize || fileObj.files[0].fileSize || fileObj.files[0].size;    
    alert(size);    
}    
</script>    
<body>    
<INPUT TYPE="file" NAME="file" SIZE="30" onchange="getFileSize(this)">   
<img id='img1' dynsrc=''/>   
</body>
</html>