Image from localstorage url return [object arraybuffer]

var req = new XMLHttpRequest();
        req.onload = function (e) {
            var arraybuffer = oReq.response;
        }
        req.open("GET", '/zTest.jpg');
        req.responseType = "arraybuffer";
        req.send();
        req.addEventListener('readystatechange', function () {
            if (req.readyState === 4) {
                localStorage.setItem('photo', req.response);
            }
        });

var img = new Image();
            img.src = localStorage.photo;
            $('.imagearea').html(img);

<img src="[object ArrayBuffer]">