https://rawgit.com/aneelkkhatri/2e197eaddeb2285cbf958374354ba2d1/raw/XHRHelper.js

XHRHelper.js

var XHRHelper = (function(){
	
	function initParams(params) {
		if (!params.type) {
			params.type = "GET";
		};
	}
	return {
		request: function(params, async = true) {
			var xhr = new XMLHttpRequest();
			initParams(params);

			xhr.onload = function() {
				if (params.success) {
					params.success(xhr);
				};
			};

			xhr.onerror = function () {
				if (params.error) {
					params.error(xhr);
				};
			}

			xhr.open(params.type, params.url, async);
			xhr.send();
			
			return xhr;
		}
	}
})();