1.代码：
<%--
Document : index
Created on : 2009-10-4, 13:56:46
Author : lucifer
--%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function giveFocus(){
document.login.user.focus()
}
function submitForm(){
document.login.submit()
}
function resetForm(){
document.login.reset()
document.login.user.focus()
}
</script>
</head>
<body bgcolor="#c0c0c0" link="#999999" alink="#999999" vlink="#999999"
onload="giveFocus()">
<center>
<font size="+2">
<br><br>
<B>LOGIN</B>
</font>
<br><br><br><br>
<form name="login" method="post"
action="http://wenda.tianya.cn/wenda/thread?tid=129583d1f709f89f">
<table width="50%">
<tr>
<td align="right">
<font size="+1">
<B>User ID</B>
</font>
</td>
<td>
<font size="+1">
<input type="text" name="user" maxlength="9">
</font>
</td>
</tr>
<tr>
<td align="right">
<font size="+1">
<B>Password</B>
</font>
</td>
<td>
<font size="+1">
<input type="password" name="password"
maxlength="8">
</font>
</td>
</tr>
</table>
<br><br><br>
<font size="+1">
<B>
<input type="button" value="LOGIN" onclick="submitForm()">
<input type="button" value="RESET" onclick="resetForm()">
<br>
</B>
</font>
</form>
</center>
</body>
</html>
2.结论：
"formname".submit()作用与<input type="submit" ......>相同，就是提交表单数据，如果button和submit同时存在，只有submit有提交表单的作用