手写axios拦截器

import {Message} from 'element-ui'
import axios from 'axios'
import {router} from '../router'
function request (url, data={}, method="get", options, responseType) {
  let axios = createAxiosInstance(options)
  return axios({
    url,
    data: method.toLowerCase() === 'get' ? {} : data,
    params: method.toLowerCase() === 'get' ? data : {},
    method: method.toLowerCase(),
    responseType: responseType || 'json'
  })
}

function createAxiosInstance (options) {
  let instance = axios.create({
    timeout: 5000,
    withCredentials: true,
    header: Object.assign({
      'X-Request-With': 'XMLHttpRequest',
      'Content-Type': 'application/json;charset=UTF-8'
    })
  })
  instance.interceptors.request.use(
    config => config,
    error => Promise.reject(error)
  ),
  instance.interceptors.request.use(
    response => {
      let res = response.data
      if (res.code === 0) return res
      else Message({
        message: res.message,
        type: 'error',
        duration: 5000
      })
    },
    error => {
      if (error.errorCode === 401) return router.psuh('/login')
      else Message({
        message: error.message,
        type: 'error',
        duration: 5000
      })
    }
  )
  return instance
}

export default request