Prototype的Ajax支持使用Ajax.PeriodicalUpdater类
简单的说：它就是一个周期性的Ajax.Updater。
?
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://"+ request.getServerName() + ":" + request.getServerPort()+ path + "/";%><!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><title>定时刷新价格</title><meta name="author" content="Yeeku.H.Lee" /><meta name="website" content="http://www.crazyit.org" /><meta http-equiv="Content-Type" content="text/html; charset=GBK" /></head><body><h3>今天的苹果价格为：</h3>苹果价格为：<span style="color: red" id="price"></span>元/斤<script src="js/prototype-1.6.0.3.js" type="text/javascript"></script><script type="text/javascript">//发送请求的服务器URLvar url = 'price.jsp';//创建Ajax. PeriodicalUpdater对象，周期性发送Ajax请求var myAjax = new Ajax.PeriodicalUpdater(//price用于显示服务器响应'price', url, {//定义发送请求的方法method : 'post',//定义请求参数为nullparameters : null,//发送请求的频率frequency : 1});</script></body></html>?
<%@ page contentType="text/html; charset=GBK" language="java" %><%//输出一个伪随机数out.println(Math.round(Math.random() * 10));%>
?