Ajax的GET,POST方法传输数据和接收返回数据

//首先创建一个Ajax对象

function ajaxFunction(){
var xmlHttp;
try{ // Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e){
try{// Internet Explorer
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){}
}
}

return xmlHttp;
}
--------------------- 
GET方法

function get() {
//获取对象
var request = ajaxFunction();
//传输数据到你的某个Servlet
request.open("GET" ,"/myAjax/Demo01?name=czc&age=22" ,true);

//接收返回的数据，只发送可以不写
request.onreadystatechange=function(){
if(request.readyState==4 && request.status==200){
alert(request.responseText);
}
}

//发送数据
request.send();
}
--------------------- 
POST方法

function post(){
//获取对象
var request = ajaxFunction();
//发送的地址
request.open("POST" ,"/myAjax/Demo01" ,true);
//接收返回的数据
request.onreadystatechange=function()
{
if (request.readyState==4 && request.status==200)
{
alert(request.responseText);
}
}
//设置头
request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
//发送数据的内容
request.send("name=cz&age=22");

}
---------------------