JQuery 简写Ajax请求

var xmlHttpRequest;

function AjaxInJquery() {
if (window.XMLHttpRequest) {
xmlHttpRequest = new XMLHttpRequest();
} else {
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}

this.ajaxReuest = function () {
var ajaxWay = arguments[0][0];
var ajaxPath = arguments[0][1];
var ajaxParam = arguments[0][2];
var ajaxFn = arguments[0][3];
xmlHttpRequest.onreadystatechange = function () {
if (((xmlHttpRequest.readyState === 4))) {
ajaxFn(xmlHttpRequest.responseText);
}
};
xmlHttpRequest.open(ajaxWay, ajaxPath);
xmlHttpRequest.send(ajaxParam);
}
}

var ajaxHttpRequest;
(function ($) {
ajaxHttpRequest || (ajaxHttpRequest = new AjaxInJquery());

$.extend({
get: function (url, params, fn) {
var arr = ["get", url, params, fn];
ajaxHttpRequest.ajaxReuest(arr);
},
post: function (url, params, fn) {
var arr = ["get", url, params, fn];
ajaxHttpRequest.ajaxReuest(arr);
}
});
})(jQuery);

$(() => {
window.onload = function() {
$.get("111.txt", { id: "222" }, function (res) {
console.log(res, "aa");
});
}
});