<form name="form1" enctype="multipart/form-data" method="post" action="">
<input type="file" name="file1">
<input type="button" name="Submit" value="清除" onclick="document.form1.file1.select();document.execCommand('Delete');">
</form>
<input type="file" name="file1">
<input type="button" name="Submit" value="清除" onclick="document.form1.file1.select();document.execCommand('Delete');">
</form>
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