Prototype的Ajax支持使用Form.request方法
Form.request（）方法实际上是Ajax.Request的封装，该方法会将所有的表单控件转换为请求参数，默认的向该表单的action指定的URL发送异步请求。
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一个简单的用法例子：
<%@ 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>使用Form.request</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>请输入用户名、密码登录</h3><form id="login" action="LoginServlet" method="post">用户名：<input name="user" type="text" /><br />密码：<input name="pass" type="text" /><br /><input value="登录" type="button" onclick="login();"/></form><script src="js/prototype-1.6.0.3.js" type="text/javascript"></script><script type="text/javascript">//处理登录函数function login() {//使用Form的request发送异步请求$("login").request( {//指定回调函数onComplete : function(request) {alert(request.responseText);}});}</script></body></html>?Servlet的代码：import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");response.setContentType("text/html;charset=UTF-8");String user = request.getParameter("user");String pass = request.getParameter("pass");PrintWriter out = response.getWriter();if (user.equals("libinxuan") && pass.equals("123456")){out.println("登录成功！！");}else{out.println("登录失败！！");}}}?