实现代码如下：
<%@ 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>用户注册</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 = reg.UserName.value;
for (nIndex=0; nIndex<struserName.length; nIndex++)
{
cCheck = struserName.charAt(nIndex);
if (!(IsDigit(cCheck) || IsAlpha(cCheck)))
{
return false;
}
}
return true;
}
function chkEmail(str)
{
return str.search(/[\w\-]{1,}@[\w\-]{1,}\.[\w\-]{1,}/)==0?true:false
}
function docheck()
{
if(reg.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(reg.UserPassword.value=="")
{
alert("请填写密码");
return false;
}
else if(reg.UserPassword.value != reg.CUserPassword.value)
{
alert("两次密码不一致");
return false;
}
else if(reg.NickName.value =="")
{
alert("请填写昵称");
return false;
}
else if(reg.Email.value =="")
{
alert("请填写邮箱");
return false;
}
else if(!chkEmail(reg.Email.value))
{
alert("请填写有效的Email地址");
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">用户注册</h1>
<div align="center">
<form name="reg" action="user_add.jsp" method="post" target="_self" onSubmit="return docheck()">
<table width="90%" border="0">
<tr>
<td width="50%" align="right" height="25"><font face="Arial, Helvetica, sans-serif">请输入要注册的用户名：</font></td>
<td width="50%" align="left" height="25">
<input type="text" name="UserName">
<br>
<font color="red"> 用户名只能由字母和数字组成</font>
</td>
</tr>
<tr>
<td width="50%" align="right" height="25">请输入密码：</td>
<td width="50%" align="left" height="25"> <input type="password" name="UserPassword"></td>
</tr>
<tr>
<td width="50%" align="right" height="25">请输入确认密码：</td>
<td width="50%" align="left" height="25"> <input type="password" name="CUserPassword"></td>
</tr>
<tr>
<td width="50%" align="right" height="25">请输入昵称：</td>
<td width="50%" align="left" height="25"> <input type="text" name="NickName"></td>
</tr>
<tr>
<td width="50%" align="right" height="25">请选择性别：</td>
<td width="50%" align="left" height="25"> <input type="radio" name="Sex" value="0" checked>男 <input type="radio" name="Sex" value="1">女</td>
</tr>
<tr>
<td width="50%" align="right" height="25">请输入Email地址：</td>
<td width="50%" align="left" height="25"> <input type="text" name="Email"></td>
</tr>
</table>
<p>
<input type="submit" name="sub" value="注册">
<input type="reset" name="res" value="重填">
</p>
</form>
</div>
</body>
</html>
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