ajax进行操作不需要写表单，例如修改密码操作

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<script type="text/javascript">
	function submitForm(){
		var userId='${currentUser.userId}';
		var password='${currentUser.password}';
		var oldPassword=$("#oldPassword").val();
		var newPassword=$("#newPassword").val();
		var newPassword2=$("#newPassword2").val();
		if(oldPassword==null || oldPassword==""){
			alert("原密码不能为空！");
			return false;
		}
		if(newPassword==null || newPassword==""){
			alert("新密码不能为空！");
			return false;
		}
		if(newPassword2==null || newPassword2==""){
			alert("确认新密码不能为空！");
			return false;
		}
		if(password!=oldPassword){
			alert("原密码错误！");
			return false;
		}
		if(newPassword!=newPassword2){
			alert("确认新密码不一致！");
			return false;
		}
		
		$.post("user!save",{userId:userId,password:newPassword},
			function(result){
				var result=eval('('+result+')');
				if(result.errorMsg){
					alert(result.errorMsg);
				}else{
					alert("密码修改成功，下一次登录生效！");
					resetValue();
				}
			}
		);
	}
	
	function resetValue(){
		$("#oldPassword").val("");
		$("#newPassword").val("");
		$("#newPassword2").val("");
	}
</script>
<div class="data_list">
	<div class="data_content">
		<table align="center">
			<tr>
				<td><label>用户名：</label></td>
				<td>
					<input type="text" id="userName" value="${currentUser.userName }" readonly="readonly" />
				</td>
			</tr>
			<tr>
				<td><label>原密码：</label></td>
				<td><input type="password" id="oldPassword" /></td>
			</tr>
			<tr>
				<td><label>新密码：</label></td>
				<td><input type="password" id="newPassword" /></td>
			</tr>
			<tr>
				<td><label>确认新密码：</label></td>
				<td><input type="password" id="newPassword2" /></td>
			</tr>
			<tr>
				<td>
					<input type="button" class="btn  btn-primary" value="提交" onclick="submitForm()"/>
				</td> 
				<td>
					<input type="button" class="btn  btn-primary" value="重置" onclick="resetValue()"/>
				</td>
			</tr>
		</table>
	</div>
</div>