📄 user_login.jsp
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<%@ page contentType="text/html; charset=gb2312" language="java"%>
<!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=gb2312">
<title>用户登录</title>
<script language="javascript">
function IsDigit(cCheck)
{
return (('0'<=cCheck) && (cCheck<='9'));
}
function IsAlpha(cCheck)
{
return ((('a'<=cCheck) && (cCheck<='z')) || (('A'<=cCheck) && (cCheck<='Z')))
}
function IsValid()
{
var struserName = login.UserName.value;
for (nIndex=0; nIndex<struserName.length; nIndex++)
{
cCheck = struserName.charAt(nIndex);
if (!(IsDigit(cCheck) || IsAlpha(cCheck)))
{
return false;
}
}
return true;
}
function docheck()
{
if(login.UserName.value=="")
{
alert("请填写用户名");
return false;
}
else if(!IsValid())
{
alert("用户名只能使用字母和数字");
return false;
}
else if(login.UserPassword.value=="")
{
alert("请填写密码");
return false;
}
else
{
return true;
}
}
</script>
<STYLE type=text/css>
td, th {
font-family: Arial, Helvetica, sans-serif;
font-size: 14px;
line-height: 24px;
color: #333333;
}
</STYLE>
</head>
<body>
<h1 align="center">用户登录</h1>
<div align="center">
<form name="login" action="user_login_check.jsp" method="post" target="_self" onSubmit="return docheck()">
<table width="90%">
<tr>
<td width="50%" align="right" height="25">用户名：</td>
<td width="50%" align="left" height="25"><input type="text" name="UserName"></td>
</tr>
<tr>
<td width="50%" align="right" height="25">密码：</td>
<td width="50%" align="left" height="25"><input type="password" name="UserPassword"></td>
</tr>
</table>
<p>
<input type="submit" name="sub" value="登录">
<input type="reset" name="res" value="重填">
</p>
</form>
</div>
</body>
</html>
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