iframe实现文件的异步提交
<form action="upload.jsp" id="form1" name="form1" encType="multipart/form-data" method="post" target="hidden_frame" >
<input type="file" id="file" name="file" style="width:450">
<INPUT type="submit" value="上传文件"><span id="msg"></span> <br>
<iframe name='hidden_frame' id="hidden_frame" style='display:none'></iframe>
</form>

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