在数据量不多的时候采用GET方式，数据量稍大的时候POST方式
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>GET VS. POST</title>
<script language="javascript">
var xmlHttp;
//创建异步对象
function createXMLHttpRequest(){
//如果为IE浏览器则采用ActiveXObject方法，否则采用XMLHttpRequest函数
if(window.ActiveXObject)
xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
else if(window.XMLHttpRequest)
xmlHttp = new XMLHttpRequest();
}
//用户填写的请求数据统一用一个函数编写
function createQueryString(){
var firstName = document.getElementById("firstName").value;
var birthday = document.getElementById("birthday").value;
var queryString = "firstName=" + firstName + "&birthday=" + birthday;
return encodeURI(encodeURI(queryString)); //两次编码解决中文乱码问题
}
//GET请求，直接将数据放到URL中，send()方法不发送任何数据
function doRequestUsingGET(){
createXMLHttpRequest();
var queryString = "9-3.aspx?";
//new Date().getTime每次请求URL地址不同，解决缓存问题。否则服务器改下结果，客户端刷新页面不能看到更改的效果
queryString += createQueryString() + "×tamp=" + new Date().getTime();
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.open("GET",queryString);
xmlHttp.send(null);
}
//POST模式，地址中没任何信息，数据统一在send()方法中发送，并且必须设置请求文件头
function doRequestUsingPOST(){
createXMLHttpRequest();
var url = "9-3.aspx?timestamp=" + new Date().getTime();
var queryString = createQueryString();
xmlHttp.open("POST",url);
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttp.send(queryString);
}
//处理返回数据
function handleStateChange(){
if(xmlHttp.readyState == 4 && xmlHttp.status == 200){
var responseDiv = document.getElementById("serverResponse");
responseDiv.innerHTML = decodeURI(xmlHttp.responseText); //解码
}
}
</script>
</head>
<body>
<h2> 输入姓名和生日</h2>
<form>
<input type="text" id="firstName" /><br>
<input type="text" id="birthday" />
</form>
<form>
<input type="button" value="GET" onclick="doRequestUsingGET();" /><br>
<input type="button" value="POST" onclick="doRequestUsingPOST();" />
</form>
<div id="serverResponse"></div>
</body>
</html>
服务器端处理文件9-3.aspx
<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %>
<%@ Import Namespace="System.Data" %>
<%
//根据不同请求进行处理
if(Request.HttpMethod == "POST")
Response.Write("POST: " + Request["firstName"] + ", your birthday is " + Request["birthday"]);
else if(Request.HttpMethod == "GET")
Response.Write("GET: " + Request["firstName"] + ", your birthday is " + Request["birthday"]);
%>
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