react 封装 请求拦截器

import axios from "axios";
axios.defaults.timeout = 50000;
axios.defaults.baseURL = "http://localhost:3000";
/**
* http request 拦截器
**/
axios.interceptors.request.use(
   (config) => {
       config.data = JSON.stringify(config.data);
       config.headers = {
           "Content-Type": "application/json",
       };
       return config;
   },
   (error) => {
       return Promise.reject(error);
   }
);
/**
* http response 拦截器
*/
axios.interceptors.response.use(
   (response) => {
       if (response.data.errCode === 2) {
           console.log("过期");
       }
       return response;
   },
   (error) => {
       console.log("请求出错：", error);
   }
);
/**
* 封装get方法
* @param url  请求url
* @param params  请求参数
* @returns {Promise}
*/
export function get(url, params = {}) {
   return new Promise((resolve, reject) => {
       axios.get(url, {
           params: params,
       }).then((response) => {
           landing(url, params, response.data);
           resolve(response.data);
       })
           .catch((error) => {
               reject(error);
           });
   });
}
/**
* 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) => {
               //关闭进度条
               resolve(response.data);
           },
           (err) => {
               reject(err);
           }
       );
   });
}
/**
* 封装patch请求
* @param url
* @param data
* @returns {Promise}
*/
export function patch(url, data = {}) {
   return new Promise((resolve, reject) => {
       axios.patch(url, data).then(
           (response) => {
               resolve(response.data);
           },
           (err) => {
               msag(err);
               reject(err);
           }
       );
   });
}
/**
* 封装put请求
* @param url
* @param data
* @returns {Promise}
*/
export function put(url, data = {}) {
   return new Promise((resolve, reject) => {
       axios.put(url, data).then(
           (response) => {
               resolve(response.data);
           },
           (err) => {
               msag(err);
               reject(err);
           }
       );
   });
}
//统一接口处理，返回数据
export default function (fecth, url, param) {
   let _data = "";
   return new Promise((resolve, reject) => {
       switch (fecth) {
           case "get":
               console.log("begin a get request,and url:", url);
               get(url, param)
                   .then(function (response) {
                       resolve(response);
                   })
                   .catch(function (error) {
                       console.log("get request GET failed.", error);
                       reject(error);
                   });
               break;
           case "post":
               post(url, param)
                   .then(function (response) {
                       resolve(response);
                   })
                   .catch(function (error) {
                       console.log("get request POST failed.", error);
                       reject(error);
                   });
               break;
           default:
               break;
       }
   });
}
//失败提示
function msag(err) {
   if (err && err.response) {
       switch (err.response.status) {
           case 400:
               alert(err.response.data.error.details);
               break;
           case 401:
               alert("未授权，请登录");
               break;
           case 403:
               alert("拒绝访问");
               break;
           case 404:
               alert("请求地址出错");
               break;
           case 408:
               alert("请求超时");
               break;
           case 500:
               alert("服务器内部错误");
               break;
           case 501:
               alert("服务未实现");
               break;
           case 502:
               alert("网关错误");
               break;
           case 503:
               alert("服务不可用");
               break;
           case 504:
               alert("网关超时");
               break;
           case 505:
               alert("HTTP版本不受支持");
               break;
           default:
       }
   }
}
/**
* 查看返回的数据
* @param url
* @param params
* @param data
*/
function landing(url, params, data) {
   if (data.code === -1) {
   }
}