javaweb(userZ.jsp)
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
</head>
<body>
<div style="position:absolute;100%;height:100%;background:#7FDBFF;">
<h1>用户注册</h1>
<form action="${pageContext.request.contextPath}/UserServlet?method=add" method="post">
<table>
<td>id:</td>
<td><input type="text" name="UserID"id="UserID" style="400px;height:30px"><br></td>
<tr>
<td>用户姓名:</td>
<td><input type="text" name="UserName" style="400px;height:30px"><br></td>
</tr>
<tr>
<td>性别:</td>
<td><input type="text" name="sex" style="400px;height:30px"><br></td>
</tr>
<tr>
<td>身份证号:</td>
<td><input type="text" name="idNumber" style="400px;height:30px"><br></td>
</tr>
<tr>
<td>手机号:</td>
<td><input type="text" name="Phone" style="400px;height:30px"><br></td>
</tr>
<tr>
<td>家庭住址:</td>
<td><input type="text" name="User" style="400px;height:30px"><br></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="password" name="Password" style="400px;height:30px"><br></td>
</tr>
<tr>
<td><button type="submit" onclick="return check()">提交</button></td>
<td><button type="button" onclick="history.back(-1)">返回</button></td>
</tr>
</table>
</form>
</div>
</body>
<script type="text/javascript">
function check() //封装一个<body>中做成点击事件的函数
{
if(document.getElementById('UserID').value=='') {
alert('密码不能为空！');
return false;
}else {return true;}
}
</script>
</html>