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(1)创建ajax对象
var xhr = new XMLHttpRequest();
(2)打开请求
//请求方法自定，第三个参数通常设为true，异步请求 xhr.open('GET', url, true);
(3)发送请求
//可选，设置请求头，根据需要定，post请求的话要写
//xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded"); xhr.
send(要发送的数据);
(4)接收响应
//服务器响应状态(readyState)改变时都会被执行 xhr.onreadystatechange = function(){ //0
（未初始化）对象已经创建，但还没有调用open()方法 //1 （启动）已经调用open() 方法，但尚未调用send()方法发送请求 //2
（发送）send()方法已调用，请求已经发送完成，但尚未接收到响应 //3 （接收）已经接收到部分响应数据 //4
（完成）已经接收到了全部数据，而且已经可以在客户端使用了 //服务器响应状态(readyState)和响应的HTTP状态(status)同时满足才算成功 if
(xhr.readyState==4 && xhr.status==200){ //通过xhr.responseText，获得服务器返回的内容 console.
log(xhr.responseText) } }
