text: import axios from 'axios'
  import { MessageBox, Message } from 'element-ui'
  import qs from 'qs'
  import store from '@/store'
  import { getToken } from '@/utils/auth'
  import { typeOf } from '@/utils/index'
  
  let msgBoxInstance = null
  // create an axios instance
  const service = axios.create({
    baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
    withCredentials: true, // send cookies when cross-domain requests
    timeout: 30000, // request timeout
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded'
    },
    transformRequest: [function(data, headers) {
      if (typeOf(data) === 'FormData') {
        return data
      } else {
        const params = {}
        for (const key in data) {
          if (typeof data[key] === 'string') {
            data[key] = data[key].trim()
          }
          if (data[key] !== '') {
            params[key] = data[key]
          }
        }
        if (headers['Content-Type'] === 'application/x-www-form-urlencoded') {
          return qs.stringify(params)
        } else {
          return JSON.stringify(params)
        }
      }
    }]
  })
  
  // request interceptor
  service.interceptors.request.use(
    config => {
      // do something before request is sent
  
      if (store.getters.token) {
        // let each request carry token
        // ['X-Token'] is a custom headers key
        // please modify it according to the actual situation
        config.headers['X-Token'] = getToken()
      }
      return config
    },
    error => {
      // do something with request error
      console.log(error) // for debug
      return Promise.reject(error)
    }
  )
  
  // response interceptor
  service.interceptors.response.use(
    /**
     * If you want to get http information such as headers or status
     * Please return  response => response
    */
  
    /**
     * Determine the request status by custom code
     * Here is just an example
     * You can also judge the status by HTTP Status Code
     */
    response => {
      const res = response.data
  
      // if the custom code is not 20000, it is judged as an error.
      if (res.code !== 20000) {
        // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
        if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
          if (!msgBoxInstance) {
            // to re-login
            msgBoxInstance = MessageBox.alert('登录已失效，请重新登录', '重新登录', {
              confirmButtonText: '重新登录',
              showClose: false,
              type: 'warning'
            }).then(() => {
              store.dispatch('user/resetToken').then(() => {
                location.reload()
              })
            })
          }
        } else if (res.resultCode === 50008 || typeOf(res) === 'Blob') {
          return res
        } else {
          Message.closeAll()
          Message({
            message: res.message || 'Error',
            type: 'error',
            duration: 5 * 1000
          })
        }
        return Promise.reject(new Error(res.message || 'Error'))
      } else {
        return res
      }
    },
    error => {
      console.log('err' + error) // for debug
      Message({
        message: error.message,
        type: 'error',
        duration: 5 * 1000
      })
      return Promise.reject(error)
    }
  )
  
  export default service
  