標籤：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
//建立XMLHttpRequest對象
var xmlhttp;
function createXmlHttp(){
//alert("come in");
//xmlhttp=new ActiveXObject("Msxml2.XMLHTTP"); //在IE中不可以
xmlhttp=new XMLHttpRequest(); //都可以建立XMLHttpRequest
return xmlhttp;
}
//處理函數
function deal(){
//請求狀態等於4，響應狀態=200；
if(xmlhttp.readyState==4){
if(xmlhttp.status==200){ //返回200，表示和伺服器正常互動完成
alert(xmlhttp.responseText);//擷取伺服器返回的結果；
}else{
alert(xmlhttp.status);
}
}
}
//xmlhttp=createXmlHttp();
//alert(xmlhttp);
function send(){
//建立xmlhttpRequest對象
xmlhttp=createXmlHttp();
//綁定狀態函數
xmlhttp.onreadystatechange=deal;
alert("come on");
var url="http://localhost:8080/fujindehuodong/ajaxServer.jsp?age=16"; //URL地址是伺服器位址，而且必須是絕對位址
xmlhttp.open(‘get‘,url,true);
//發送請求；
xmlhttp.send(null);
}
</script>
</head>
<body>
<div id="msg"></div>
<br/>
<input type="button" value="發 送" onclick="send()"></input>
</body>
</html>
伺服器那邊的代碼：用JSP
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
int age=Integer.parseInt(request.getParameter("age"));
//system.out.println("age="+age);
String str="";
if(age<18){
str="你是未成年人，不允許訪問我們網站";
}else{
str="您已經成年，瞎搞把開始";
}
out.write(str);
%>
Ajax 學習之擷取伺服器的值
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