怎么创建通用的AJAX对象

Question

怎么创建通用的AJAX对象

Answer 1

判断服务器是否支持ajaxfunction tel() {var tel = false;try {tel = new XMLHttpRequest();} catch(e) {//针对ie浏览器try {tel = new ActiveXObject('Msxml2.XMLHTTP');//ie8} catch(e) {try {tel = new ActiveXObject('Microsoft.XMLHTTP');} catch(e) {alert('你的浏览器不支持ajax');}}}return tel;}方法二：function tel() {var tel = false;if(window.XMLHttpRequest) {tel = new XMLHttpRequest();} else {tel = new window.ActiveXObject('Microsoft.XMLHTTP');}return tel;}

Answer 2

function btn_click() {//创建XMLHttpRequest对象var xmlHttp = new XMLHttpRequest();//获取值var username = document.getElementById("txt_username").value;var age = document.getElementById("txt_age").value;//配置XMLHttpRequest对象xmlHttp.open("get", "action?user=" + <%=user%>,true);//设置回调函数xmlHttp.onreadystatechange = function () {if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {document.getElementById("result").innerHTML = xmlHttp.responseText;}}//发送请求xmlHttp.send(null);}