npm install axios --save

import axios from 'axios';
import router from '../router';

axios.defaults.timeout = 5000; //请求超时5秒
axios.defaults.baseURL =''; //请求base url
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded'; //设置post请求是的header信息

axios.defaults.withCredentials = true

//http request 拦截器
axios.interceptors.request.use(
 config => {
 let token = sessionStorage.getItem('token')
 if (token) { // 判断是否存在token，如果存在的话，则每个http header都加上token
  config.headers = {
  'X-token': token
  }
 }
 
 return config
 }, 
 err => {
 return Promise.reject(err)
 }
)

axios.interceptors.response.use(
 response => {
 if (response.data.code === 4003) {
  Toast({
  mes: '您没有权限操作！',
  timeout: 1500,
  callback: () => {
   router.go(-1);
  }
  });
  
  return false;
 }
 if (response.data.code === -1) {
  localStorage.removeItem('token')
  router.push({
  path:"/login",
  querry:{redirect: router.currentRoute.fullPath}//从哪个页面跳转
  })
 }
 return response
 }, 
 err => {
 if (err.code === 'ECONNABORTED' && err.message.indexOf('timeout') !== -1) {
  Toast({
   mes: '网络异常，连接超时...',
   timeout: 1500
  });
 }
 return Promise.reject(err)
 }
)

/**
 * 封装get方法
 * @param url
 * @param data
 * @returns {Promise}
 */

export function get(url, params={}, headers={}){
 return new Promise((resolve, reject) => {
 axios.get(url,{
  params: params,
  headers: headers
 })
 .then(response => {
  resolve(response.data);
 })
 .catch(err => {
  reject(err)
 })
 })
}

/**
 * 封装post请求
 * @param url
 * @param data
 * @returns {Promise}
 */

 export function post(url, data = {}){
 return new Promise((resolve, reject) => {
  axios.post(url, data)
  .then(response => {
  resolve(response.data);
  }, err => {
  reject(err)
  })
 })
 }

import {post,get} from './utils/http'
//定义全局变量
Vue.prototype.$post = post;
Vue.prototype.$get = get;

this.$post(url, params)
 .then((res) => {
 if (res.result === 'success') {
  this.$message({
  message: '登录成功！',
  type: 'success'
  })
  this.$router.push('/main')
 } else {
  this.$message.error(res.msg)
  this.refreshCode();
 }
 });