## 原生Ajax (1)**创建XMLHttpRequest对象**var xhr = new XMLHttpRequest() (2)**与服务器建立连接**open(Method,Url,IsAsync)，如：open("get","url") (3)**发送HTTP请求**  xhr.send( ) (4)**响应**xhr.onreadystatechange = function(){} ~~~ <script> var url = "https://www.easy-mock.com/mock/5c2dbaee32924755e4c0dc04/vue-travel/home"; var a = new XMLHttpRequest(); a.open("get", url); a.send(); a.onreadystatechange = function () { if (a.readyState === 4 && a.status == 200) { //JSON.parse()将字符串转为json对象 var reponse = JSON.parse(a.responseText); console.log(reponse) } } </script> ~~~