vue封装的请求拦截器

import axios from "axios"; //引入axios
import QS from "qs";
import Vue from "vue";
import { Loading } from 'element-ui';
import i18n from "@/locales"
var loading = null;
if (localStorage.getItem("URL") == null) {
  localStorage.setItem("URL", "http://linkstec.ltd:3000");
  if (process.env.NODE_ENV !== "production") {
    localStorage.setItem("URL", "http://localhost:3000");
  }
}
const service = axios.create({
  baseURL: localStorage.getItem(".URL")
  headers: { "Content-Type": "application/json;charset=UTF-8" },"multipart/form-data;charset=UTF-8"
});
service.defaults.withCredentials = true;
// request拦截器
service.interceptors.request.use(
  (config) => {
    if (sessionStorage.getItem("TOKEN") != null) {
      config.headers.common["token"] = sessionStorage.getItem("TOKEN");
      config.headers.common["userId"] = sessionStorage.getItem("USERID");
    }
    //这里是每个请求的设置，比如每个请求都携带一个token，或者当为post请求时，引入qs格式化参数。
    loading = Loading.service({
      lock: true,
      text: i18n.t("LOADING"),
      spinner: 'el-icon-loading',
      background: 'rgba(0, 0, 0, 0.7)'
    });
    return config;
  },
  (error) => {
    console.log("请求失败:" + error);
    loading.close();
    Promise.reject(error);
  }
);
// response 拦截器
service.interceptors.response.use(
  (response) => {
    loading.close();
    if (response.data.code == "0") {
      return response.data;
    } else {
      Vue.prototype.showCommonAlert(response.data.msg);
      return Promise.reject(response);
    }
  },
  (error) => {
    loading.close();
    if (error.response == null) {
      Vue.prototype.showCommonAlert("WRN0004");
    }
    Vue.prototype.showCommonAlert(error.response.data.msg);
    return Promise.reject(error);
  }
);
export default service;
export function get(url, params, config) {
  params = Object.assign({}, params, {});
  if (config == null || config == undefined) {
    config = { "Content-Type": "application/json;charset=UTF-8" };
  }
  return new Promise((resolve, reject) => {
    service
      .get(url, { params }, config)
      .then((res) => {
        resolve(res);
      })
      .catch((err) => {
        reject(err);
      });
  });
}
export function post(url, params, config) {
  if (params instanceof FormData) {
  } else {
    params = Object.assign({}, params, {
    });
  }
  if (config == null) {
    config = { "Content-Type": "application/json;charset=UTF-8" };
    params = QS.parse(params);
  }
  return new Promise((resolve, reject) => {
    service
      .post(url, params, config)
      .then((res) => {
        resolve(res);
      })
      .catch((err) => {
        reject(err);
      });
  });
}