封装ajax

function get(url, success) {    let ajix = new XMLHttpRequest()    ajix.open('GET', url,true)    ajix.onreadystatechange = () => {        if (ajix.readyState === 4) {            if (ajix.status === 200) {                let data = JSON.parse(ajix.response)                success(data)            }        }    }    ajix.send()}