axios:"timeout of 5000ms exceeded"超时

import axios from 'axios'
import { BASE_URL } from './http'
import router from '../router'
 
// create an axios instance
const service = axios.create({
  baseURL: BASE_URL, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 5000 // request timeout
})
 
 
// 设置请求次数，请求的间隙
service.defaults.retry = 4;
service.defaults.retryDelay = 1000;
 
// request interceptor
service.interceptors.request.use(
  config => {
    // do something before request is sent
    return config
  },
  error => {
    // do something with request error
    // console.log(error) // for debug
    return Promise.reject(error)
  }
)
 
// response interceptor
service.interceptors.response.use(
  response => {
    const res = response.data
    return res
  },
  error => {
    if (error.response) {
      // console.log('err' + error) // for debug
      switch (error.response.status) {
        case 401:
          // console.log('err status' + error.response.status)
          router.push('/login')
          break
        case 404:
          break
        case 500:
          break
      }
      return Promise.reject(error)
    } else {
      // 处理超时的情况
      let config = error.config
      // If config does not exist or the retry option is not set, reject
      if(!config || !config.retry) return Promise.reject(error)
  
      // Set the variable for keeping track of the retry count
      config.__retryCount = config.__retryCount || 0
  
      // Check if we've maxed out the total number of retries
      if(config.__retryCount >= config.retry) {
        // Reject with the error
        return Promise.reject(error)
      }
  
      // Increase the retry count
      config.__retryCount += 1
  
      // Create new promise to handle exponential backoff
      let backoff = new Promise(function(resolve) {
        setTimeout(function() {
          resolve()
        }, config.retryDelay || 1)
      })
  
      // Return the promise in which recalls axios to retry the request
      return backoff.then(function() {
        return service(config)
      })
    }
 
  }
)
 
export default service

//在main.js设置全局的请求次数，请求的间隙
axios.defaults.retry = 4;
axios.defaults.retryDelay = 1000;
 
axios.interceptors.response.use(undefined, function axiosRetryInterceptor(err) {
    var config = err.config;
    // If config does not exist or the retry option is not set, reject
    if(!config || !config.retry) return Promise.reject(err);
 
    // Set the variable for keeping track of the retry count
    config.__retryCount = config.__retryCount || 0;
 
    // Check if we've maxed out the total number of retries
    if(config.__retryCount >= config.retry) {
        // Reject with the error
        return Promise.reject(err);
    }
 
    // Increase the retry count
    config.__retryCount += 1;
 
    // Create new promise to handle exponential backoff
    var backoff = new Promise(function(resolve) {
        setTimeout(function() {
            resolve();
        }, config.retryDelay || 1);
    });
 
    // Return the promise in which recalls axios to retry the request
    return backoff.then(function() {
        return axios(config);
    });
});