src/util.js
function (result) {
            if (result && result.headers) {
                result.headers['x-cos-version-id'] && (result.VersionId = result.headers['x-cos-version-id']);
                result.headers['x-cos-delete-marker'] && (result.DeleteMarker = result.headers['x-cos-delete-marker']);
            }
            return result;
        }
function (result) {
            if (result && result.headers) {
                result.headers['x-cos-version-id'] && (result.VersionId = result.headers['x-cos-version-id']);
                result.headers['x-cos-delete-marker'] && (result.DeleteMarker = result.headers['x-cos-delete-marker']);
            }
            return result;
        }
代理回调函数