JavaScript 中：
function ajax(){
var xmlHttpRequerst;
try{
xmlHttpRequest = new XMLHttpRequest(); // code for IE7+, Firefox, Chrome, Opera, Safari
}catch(e){
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");// code for IE6, IE5
}
//执行
xmlHttpRequest.onreadystatechange(function(){
if(xmlHttpRequest.readyState==4 && xmlHttpRequest.status==200)//readyState (0/1/2/3/4) ;status(200/404)
document.getElementsById("ID").innerHTML(xmlHttpRequest.responseText);//xmlHttpRequest.responseText or xmlHttpRequest.responseXML返回参数
})
//设置参数
xmlHttpRequest.open("GET","URL?parm="+"参数",true);// open(method,url,true)1:method --can be GET or POST;2:parm --get from form;
//发送
xmlHttpRequest.send();