<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>作业题目</title>
<script language="javascript">
function sure(){
var txt1=document.getElementsByName("username");
var uname=txt1.item(0).value;
var txt2=document.getElementsByName("password");
var pword=txt2.item(0).value;
var flag=0;
if(uname.length==0){
flag=1;
alert("用户名不能为空！");
}
if(uname.length>10){
flag=1;
alert("用户名不能超过10位");
}
if(pword.length==0){
flag=1;
alert("密码不能为空！");
}else if(pword.length<6&&pword.length>0){
flag=1;
alert("您输入的密码太短,密码长度是6～10位！");
}
if(pword.length>10){
flag=1;
alert("您输入的密码太长，密码长度是6～10位！");
}
if(flag==0)
window.location.href="menu.html"
}
</script>
</head>
<body bgcolor="#CCCCF1">
<form name="login">
<table align="center">
<tr>
<td colspan="3" align="center">
<font size="6" face="Times">
<B>
作业题目
</B>
</font>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</td>
</tr>
<tr>
<td align="right">
用户名:
</td>
<td align="left">
<input name="username" size="20"/>
</td>
<td width="100">
</td>
</tr>
<tr>
<td align="right">
密码:
</td>
<td align="left">
<input name="password" type="password" size="21"/>
</td>
<td width="100">
</td>
</tr>
<tr>
<table align="center">
<tr>
<td width="240" align="right">
<button name="submit" onclick="sure()"> 确定 </button>
</td>
<td width="80" align="right">
<button name="btnReset" onclick="this.form.reset()"> 重置 </button>
</td>
<td width="250">
</td>
</tr>
</table>
</tr>
</table>
</form>
</body>
</html>
