???/*AJAX异步提交*/
???/*1.声明一个AJAX全局变量*/
???var ajaxRequest;
???function checkAjAx() {
???????/*2.创建XMLHttpRequest*/
???????ajaxRequest=new XMLHttpRequest();
???????/*3.配置请求对象*/
???????var url="user.do?uname="+$("uname").value()+"times="+new Date().getMilliseconds();
???????/*解决乱码问题,后台用URLDecoder.decode(uname,,""utf-8)*/
???????url=encodeURI(url);
???????url=encodeURI(url);
???????/*开启请求*/
??????/* /!*post提交加以下代码*!/
???????ajaxRequest.setRequestHeader("Content-Type","appplication/x-www-form-urlencoded");*/
???????ajaxRequest.open("GET",url,true);
???????/*4.准备发送状态--ajax*/
???????ajaxRequest.onreadystatechange=function () {
???????/*判断状态为AJAX，正常响应*/
???????????if (ajaxRequest.readyState==4&&ajaxRequest.status==200){
???????????????$("result").innerHTML=ajaxRequest.responseText;
???????????}
???????}
???????/*get方法send（null）填null,post方法填变量send(num)*/
???????ajaxRequest.send(null);
???}
}
AJAX异步提交（前端）
原文地址：https://www.cnblogs.com/2070393244com/p/9445417.html