Function onreadystatechange

src/lib/ajax.js:92–110

()

		xhr.send(body);

		function onreadystatechange() {
			const { readyState, status } = xhr;

			if (readyState === 2) {
				if (status >= 200 && status < 300) {
					xhr.responseType = responseType;
				} else {
					xhr.responseType = "text";
				}
			} else if (readyState === 4) {
				if (status >= 200 && status < 300) {
					const res = ajax.response(xhr);
					onsuccess(res);
					resolve(res);
				} else {
					handleError();
				}
			}
		}

		function progress(e) {
			const { loaded, total } = e;