技术栈采用vue+vuex+axios，后端是express 前端请求代码：

import axios from 'axios'
// let base = ' https://cnodejs.org/api/v1'
let base = 'http://localhost:2000'
// let base = 'https://wx.xuminjun.com'
// 自动将响应头中的token 放到请求头中去请求
// axios.defaults.withCredentials = true
axios.create({
  timeout: 1000,
  withCredentials: true
})
// 登录接口
export const login = params => {
  return axios.post(base + '/api/login', params)
    .then(res => {
      console.log(res)
      return res.data
    })
    .catch(error => { console.log(error) })
}
// 获取nodejs资讯
export const getTopics = params => { return axios.post(base + '/api/test').then(res => res.data).catch(error => { console.log(error) }) }
// 获取用户信息
export const getUser = params => { return axios.get('/getUser', {params: params}).then(res => res.data).catch((error) => { console.log(error) }) }
// 获取左侧菜单列表
export const getMenus = params => { return axios.get('/getMenus').then(res => res.data).catch(error => { console.log(error) }) }

后端代码 app.js

// 允许跨域请求
app.all('*', function (req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization, Accept, X-Requested-With , yourHeaderFeild, x-access-token');
  res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS');
  res.header('Access-Control-Allow-Credentials', 'true');
  if (req.method == 'OPTIONS') {
    res.send(200); /让options请求快速返回/
  }
  else {
    next();
  }
});

结果显示： 登录结果返回时 响应头带cookie 再次去服务器请求是 cookie请求头 丢失

请求各位大神解惑