Load and execute JS via AJAX

AJAXLoadTriggerJs.js

/*!
 * Load and execute JS via AJAX
 * gist.github.com/englishextra/8dc9fe7b6ff8bdf5f9b483bf772b9e1c
 * IE 5.5+, Firefox, Opera, Chrome, Safari XHR object
 * gist.github.com/Xeoncross/7663273
 * modified callback(x.responseText,x); to callback(eval(x.responseText),x);
 * stackoverflow.com/questions/3728798/running-javascript-downloaded-with-xmlhttprequest
 * @param {String} u path string
 * @param {Object} [f] callback function
 * @param {Object} [e] on error callback function
 * ajaxLoadTriggerJS(u,f,e)
 */
;(function () {
	var ajaxLoadTriggerJS = function (u, f, e) {
		var w = window,
		x = w.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
		x.overrideMimeType("application/javascript;charset=utf-8");
		x.open("GET", u, !0);
		x.withCredentials = !1;
		x.onreadystatechange = function () {
			if (x.status == "404") {
				if (e && "function" === typeof e) {
					e();
				}
				console.log("Error XMLHttpRequest-ing file", x.status);
				return !1;
			} else if (x.readyState == 4 && x.status == 200 && x.responseText) {
				try {
					var Fn = Function;
					new Fn("" + x.responseText).call("undefined" === typeof window ? "undefined" === typeof self ? "undefined" === typeof global ? this : global : self : window);
				} catch (m) {
					throw new Error("Error evaluating file. " + m);
				}
				if (f && "function" === typeof f) {
					f(x.responseText);
				}
			}
		};
		x.send(null);
	};
	("undefined" !== typeof window ? window : this).ajaxLoadTriggerJS = ajaxLoadTriggerJS;
}
	());