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<body>
<form name="form1">
方法1:<input type="file" name="f"><input type=button value=reset onclick="f.outerhtml=<input type=\file\ name=\f\>">
</form>
<form name=form2>
方法2:<input type="file" name=f2>
<input type=button value=reset onclick="f2.select();document.execcommand(delete)">
</form>
</body>
