<script type="text/javascript">
<!--
var queryString = "firstName=xugang&birthday=1227";
var url = "9-3.aspx?timetamp=" + new Date().getTime();
xmlHttp.open("POST",url);
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttp.send(queryString); //該語句負責發(fā)送數(shù)據(jù)
//-->
</script>

一個演示get 模式與post 模式區(qū)別的示例：

客戶端：

代碼示例：

<!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;
function createXMLHttpRequest(){
  if(window.ActiveXObject)
    xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
  else if(window.XMLHttpRequest)
    xmlHttp = new XMLHttpRequest();
}
function createQueryString(){
  var firstName = document.getElementById("firstName").value;
  var birthday = document.getElementById("birthday").value;  
  var queryString = "firstName=" + firstName + "&birthday=" + birthday;
  return encodeURI(encodeURI(queryString));  //兩次編碼解決中文亂碼問題
}
// GET 模式
function doRequestUsingGET(){
  createXMLHttpRequest();
  var queryString = "9-3.aspx?";
  queryString += createQueryString() + "&timestamp=" + new Date().getTime();
  xmlHttp.onreadystatechange = handleStateChange;
  xmlHttp.open("GET",queryString);
  xmlHttp.send(null);
}
// POST 模式
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);
}
function handleStateChange(){
  if(xmlHttp.readyState == 4 && xmlHttp.status == 200){
    var responseDiv = document.getElementById("serverResponse");
    responseDiv.innerHTML = decodeURI(xmlHttp.responseText);//解碼
  }
}
</script>
</head>
<body>
<h2>輸入姓名和生日</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>

服務器端

代碼示例：

復制代碼代碼如下:

<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %>

<%@ Import Namespace="System.Data" %>

<%

    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"]);

%>

通常在數(shù)據(jù)不多，并且不敏感的時候，使用get 模式的請求；

而數(shù)據(jù)量大，或者數(shù)據(jù)敏感的時候，使用post 模式的請求。

希望本文所述對大家的Ajax程序設計有所幫助。

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