为什么text框会默认显示自己的账号和密码
<form method="post" action="save.php">
<label for="username">用户名:</label>
<input type="text" name="username" id="username" value="" />
<label for="pass">密码:</label>
<input type="password" name="pass" id="pass" value="" />
<input type="submit" value="确定" name="submit" />
<input type="reset" value="重置" name="reset" />
</form>