function http(url,type,data) {
	return new Promise(function (resolve, reject) {
		var req = new XMLHttpRequest();
		req.open(type, url);

		req.onload = function onload() {
			if (req.status === 200) {
				resolve(req.response);
			} else {
				reject(Error(req.response));
			}
		};

		req.onerror = function onerror() {
			reject(Error('Network Error'));
		};
		req.send(data);
	});
}
function httpJSON(url, type, data) {
	return http(url, type, data).then(JSON.parse);
}
function get(url) {
	return http(url,'GET');
}
function getJSON(url) {
	return httpJSON(url, 'GET');
}