很简单的js


<html>
<head>
<title>上传文件</title>
<script type="text/javascript">
                  function select(){
                   
                  alert("nihao");
                 }               </script>
</head> <body>

<form name="uploadPrint"  method="post"
enctype="multipart/form-data" action="uploadPrint">

   选择上传的文件&nbsp;<input type= file name="upload" onchange="select()" />
<br>
</form>
<div id="image">
dfd
</div>
</body>
</html>他没啥反应，而且我希望发生onchange事件时<div id="image">dfd</div>里面有文件缩略图，麻烦