创建一个request.js用于封装axios，在 src/api/request，设置拦截器统一处理请求和相应。

封装 axios：request.js：

import axios from 'axios'
import {Message, Loading} from "element-ui"
import {getToken} from "@/utils/auth"

function Index({...config}) {
  // create an axios instance
  const service = axios.create({
    /*headers: {
      'Cache-Control': 'no-cache'
    },*/
    baseURL: config.baseURL || process.env.VUE_APP_BASE_API, // url = base url + request url
    // withCredentials: true, // send cookies when cross-domain requests
    timeout: 30000 // request timeout
  })

  // request interceptor
  service.interceptors.request.use(
    config => {
      return config
    },
    error => {
      return Promise.reject(error)
    }
  )

  // response interceptor
  service.interceptors.response.use(
    response => {
      return response
    },
    error => {
      const {request = {}} = error;
      const {status, response} = request;

      error.status = status
      try {
        error.res = JSON.parse(response)
      } catch (e) {
        console.warn(e)
      }
      return Promise.reject(error)
    }
  )

  /**
   * 发起请求
   * @param method 请求方法
   * @param url 请求地址
   * @param params 要发送的数据
   * @param config 配置
   * @param axiosConfig Axios配置项
   * @returns {Promise<never>|Promise<AxiosResponse<T>>}
   */
  const requestProcessor = (method, url, params, config, axiosConfig) => {
    const headers = {}
    const token = getToken().token
    if (token) {
      // let each request carry token
      headers['Authorization'] = 'JWT ' + token
    }

    if (config.formData) {
      const fd = new FormData();
      for (let key in params) {
        fd.append(key, params[key])
      }
      params = fd
    }

    switch (method.toUpperCase()) {
      case 'GET':
        return service.get(url, {
          params,
          headers,
          ...axiosConfig,
        })
      case 'POST':
        return service.post(url, params, {
          headers,
          ...axiosConfig,
        })
      case 'DELETE':
        return service.delete(url, {
          params,
          headers,
          ...axiosConfig,
        })
      case 'PUT':
        return service.put(url, params, {
          headers,
          ...axiosConfig,
        })
      default:
        return Promise.reject(new Error(`${method} 方法无效，请用正确的请求方法`))
    }
  }

  this.service = async ({method, url, params, config = {}, axiosConfig = {}}) => {
    const {isLoading = true, isToast = true} = config

    let loadingInstance
    isLoading && (loadingInstance = Loading.service({
      fullscreen: true,
      background: 'transparent',
      text: '加载中...'
    }))

    try {
      const response = await requestProcessor(method, url, params, config, axiosConfig)
      // 此处可以再次拦截
      return response.data
    } catch (error) {
      isToast && Message.error(error.message)
      throw error
    } finally {
      isLoading && loadingInstance.close()
    }

  }
}

export const {request} = new Index()
export default Index
接口 listing.js：

import Request from "@/api/request"

const {service} = new Request()

export default {
  userPostList({pageSize, page}) {
    return service({
      method: 'get',
      url: '/userpostlist/',
      params: {
        pageSize,
        page
      },
      config: {
        isLoading: false
      }
    })
  }
}
在 Vue 组件中使用：

import listing from "@/api/listing"

export default {
    mounted() {
      this.getList()
    },
    methods: {
      getList() {
        this.isLoading = true

        listing.userPostList({
          pageSize: this.pageSize,
          page: this.currentPage,
        }).then(data => {
          this.currentPage = parseInt(data.currentPage)
          this.total = data.total
          this.list = data.results

        }).finally(() => {
          this.isLoading = false
        })
      }
    }
}

2.async await 封装

import axios from 'axios';
import QS from 'qs'

axios.defaults.timeout = 5000;
axios.defaults.baseURL ='http://192.168.0.xxx:xxxx'; //填写域名
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=UTF-8';

axios.interceptors.request.use(
  config => {
   let token = sessionStorage.getItem('token');
   console.log(token)
   if(token){
     config.headers.Authorization = 'bearer ' + token;
   }
    return config;
  },
  error => {
    return Promise.reject(err);
  }
);

//响应拦截器即异常处理
axios.interceptors.response.use(response => {
    return response
}, err => {
    if (err && err.response) {
      switch (err.response.status) {
        case 400:
            console.log('错误请求')
          break;
        case 401:
            console.log('未授权，请重新登录')
          break;
        case 403:
          console.log('拒绝访问')
          break;
        case 404:
          console.log('请求错误,未找到该资源')
          break;
        case 405:
          console.log('请求方法未允许')
          break;
        case 408:
          console.log('请求超时')
          break;
        case 500:
          console.log('服务器端出错')
          break;
        case 501:
          console.log('网络未实现')
          break;
        case 502:
          console.log('网络错误')
          break;
        case 503:
          console.log('服务不可用')
          break;
        case 504:
          console.log('网络超时')
          break;
        case 505:
          console.log('http版本不支持该请求')
          break;
        default:
          console.log(`连接错误${err.response.status}`)
      }
    } else {
      console.log('连接到服务器失败')
    }
    return Promise.resolve(err.response)
})
const api = {
  async get (url, data) {
    try {
      let res = await axios.get(url, {params: data})
      res = res.data
      return new Promise((resolve) => {
        if (res.code === 0) {
          resolve(res)
        } else {
          reject(res)
        }
      })
    } catch (err) {
      alert('服务器出错')
      console.log(err)
    }
  },
  async post (url, data) {
    try {
      let res = await axios.post(url, QS.stringify(data))
      res = res.data
      return new Promise((resolve, reject) => {
        if (res.code === 0) {
          resolve(res)
        } else {
          reject(res)
        }
      })
    } catch (err) {
      // return (e.message)
      alert('服务器出错')
      console.log(err)
    }
  },
}
export { api }

在组件中引用require.js

import {api} from '../api/request.js'
async login(){
      let param={
        username:'admin',
        password:111111
      }
      let {data} = await api.post('url',param)
      console.log(data)
      sessionStorage['token'] = data.token;
    },
async aside(){
      let {data} = await api.get('url',{
        articleId:640,
      })
      console.log(data)
    },