高分求救??

Question

<form action="" method="post" enctype="multipart/form-data" name="form1">
  <input type="file" name="filea" size="1" style="display:none"><input type=button onclick="this.form.filea.click()" value=" 浏览 ">
</form>

Answer 1

窗体提交不会失败，但要按两次才有提交的响应，Why???????????????????

Answer 2

try<form action="" method="post" enctype="multipart/form-data" name="form1">
  <input type="file" name="filea" size="1" style="width:1;height:1;visibility:hidden">
<input type=button onclick="this.form.filea.click()" value=" 浏览 ">
</form>