vue axios request to intercept instance code

import axios from 'axios';//Introduce axios dependenciesimport { Message } from 'element-ui';
import Cookies from 'js-cookie'; //Introduce cookie operation dependenciesimport router from '@/router/index'//Introduce routing objects = 5000;
 ='';
//http request encapsulate request header interceptor(
  config => {
    var token = ''
    if(typeof ('user') === 'undefined'){
      //It's empty at this time    }else {
      token = (('user')).token
    }//Note that when using it, you need to introduce cookie methods. Recommend js-cookie     = ();
     = {
      'Content-Type':'application/json'
    }
    if(token != ''){
      = token;
    }
    return config;
  },
  error => {
    return (err);
  }
);
//http response encapsulates the background return interceptor(
  response => {
    //Redirect to login page when the return information is not logged in or the login is invalid    if( == 'W_100004' ||  == 'The user is not logged in or the login timeout, please log in!  '){
      ({
        path:"/",
        querry:{redirect:}//Which page to jump from      })
    }
    return response;
  },
  error => {
    return (error)
  }
)
/**
  * Encapsulation get method
  * @param url
  * @param data
  * @returns {Promise}
  */
export function fetch(url,params={}){
  return new Promise((resolve,reject) => {
    (url,{
      params:params
    })
      .then(response => {
        resolve();
      })
      .catch(err => {
        reject(err)
      })
  })
}
/**
  * Encapsulate post request
  * @param url
  * @param data
  * @returns {Promise}
  */
export function post(url,data = {}){
  return new Promise((resolve,reject) => {
    (url,data)
      .then(response => {
        resolve();
      },err => {
        reject(err)
      })
  })
}
/**
  * Encapsulate Excal file request
  * @param url
  * @param data
  * @returns {Promise}
  */
export function exportExcel(url,data = {}){
  return new Promise((resolve,reject) => {
    axios({
      method: 'post',
      url: url, // Request address      data: data, // Parameters      responseType: 'blob' // Indicates the data type returned by the return server    })
    .then(response => {
      resolve();
      let blob = new Blob([], {type: "application/-excel"});
      let fileName = "Order List_"+(new Date())+".xls" ;
      if () {
        (blob, fileName);
      } else {
        var link = ('a');
         = (blob);
         = fileName;
        ();
        ();
      }
    },err => {
      reject(err)
    })
  })
}
/**
  * Encapsulate patch request
  * @param url
  * @param data
  * @returns {Promise}
  */
export function patch(url,data = {}){
  return new Promise((resolve,reject) => {
    (url,data)
      .then(response => {
        resolve();
      },err => {
        reject(err)
      })
  })
}
/**
  * Encapsulate put request
  * @param url
  * @param data
  * @returns {Promise}
  */
export function put(url,data = {}){
  return new Promise((resolve,reject) => {
    (url,data)
      .then(response => {
        resolve();
      },err => {
        reject(err)
      })
  })
}