Ajax封装（亲测可用）

function ajax(options) {

let defaults = {

type: "get"

}

Object.assign(defaults, options)

let xhr = null

if (window.VBArray) {

xhr = new ActiveXObject("Msxml2.XMLHTTP")

} else {

xhr = new XMLHttpRequest()

}

xhr.open(defaults.type, defaults.url)

xhr.onload = function () {

defaults.success ? defaults.success(JSON.parse(xhr.response)) : ""

}

if (defaults.type == "get") {

xhr.send()

}

if (defaults.type == "post") {

xhr.setRequestHeader("content-Type", "application/x-www-from-urlencoded")

xhr.send(defaults.data)

}

}