WebRoot/WEB-INF/jsp/regist.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>会员注册</title>
<link href="${pageContext.request.contextPath}/css/common.css" rel="stylesheet" type="text/css" />
<link href="${pageContext.request.contextPath}/css/register.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
	function checkForm() {
		//校验用户名不能为空
		var username = document.getElementById("username").value;
		var password = document.getElementById("password").value;
		var rePassword = document.getElementById("rePassword").value;
		if (username == null || username == '') {
			alert("用户名不能为空");
			return false;
		}
		if (password == null || password == '') {
			alert("密码不能为空");
			return false;
		}
		if (rePassword == null || username == '' || rePassword != Password) {
			alert("确认密码不能为空，或者两次密码不一样");
			return false;
		}
		return true;
	}
	function checkUsername() {
		var username = document.getElementById("username").value;
		var xmlHttp = creatXMLHttpreauest();
		xmlHttp.open("GET",
				"${pageContext.request.contextPath}/registFindByid.action?username="
						+ username, true);
		xmlHttp.send(null);
		xmlHttp.onreadystatechange = function() {
			if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
				document.getElementById("span1").innerHTML = xmlHttp.responseText;
			}
		}
	}
	function creatXMLHttpreauest() {
		try {
			return new XMLHttpRequest();
		} catch (e) {
			try {
				return ActiveXObject("Msxml2.XMLHttp");
			} catch (e) {
				try {
					return ActiveXObject("micoresoftxml2.XMLHttp");
				} catch (e) {
					throw e;
				}
			}
		}
	}
	function change(){
		var img = document.getElementById("checkImg");