<%@ 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 HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <script type="text/javascript"> function createXmlHttpRequest(){ try{ return new XMLHttpRequest(); }catch(e){ try{ return new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){ try{ return new ActiveXObject("Micorsoft.XMLHTTP"); }catch(e){ throw e; } } } } window.onload = function(){ var btn = document.getElementById("btn"); btn.onclick = function(){ var xmlHttp = createXmlHttpRequest(); xmlHttp.open("GET", "/ajaxdemo/AServlet",true); xmlHttp.send(null); xmlHttp.onreadystatechange = function(){ if(xmlHttp.status == 200 && xmlHttp.readyState == 4){ var text = xmlHttp.responseText; var h1 = document.getElementById("h1"); h1.innerHTML = text; } } } } </script> </head> <body> <button id="btn">点击这里</button> <h1 id="h1"></h1> </body> </html>