dva自带的request.js不支持ie11，提示Promise未定义

const headers = { headers:{'Content-Type': 'application/x-www-form-urlencoded'}};
const cookie = {credentials: 'include'};

const baseUrl = 'http://localhost:8088/sjyzx-oauth/';

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(url, options) {
  return fetch(baseUrl + url, Object.assign({},options, headers, cookie))
    .then(checkStatus)
    .then(parseJSON)
    .then((data) => ({ data }))
    .catch((err) => ({ err }));
}

请问一下，是不是我设置了两个请求头就不可以？我用其他浏览器都没问题，或者我能不能把request.js里的请求改成ajax或者Axios，会不会对model有影响？

uncaught at anonymous
at takeEvery(auth/login, undefined) 
at anonymous 
Error: ReferenceError: “Promise”未定义