axios api封装

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

 const host = 'url'
 axios.defaults.baseURL = host;

 // 发送之前做点什么
 axios.interceptors.request.use(function (config) {
     const userId = Number(JSON.parse(sessionStorage.getItem("userId")))
     const token = sessionStorage.getItem("token")
     if (!userId) {
     }
     else if (config.method === 'post') {
         config.data = {
             ...config.data,
             userId,
             token
         }
         // console.log(config.data)
     } else if (config.method === 'get') {
         config.params = {
             ...config.params,
             userId,
             token
         }
     }
     return config
 }, function (error) {
     // 对请求错误做些什么
     return Promise.reject(error);
 });

 //post
 export const login = data => {
     return axios.post('xxx', data, {
         transformRequest: [(data) => {
             return qs.stringify(data)
         }],
     }).then((res) => {
         return Promise.resolve(res.data)
     }).catch((err) => {
         alert('错误')
     })
 }

 //get
 export const getKeys = data => {
     return axios.get('xxx', {
         params: data
     }, {
             transformRequest: [(data) => {
                 return qs.stringify(data)
             }],
         }).then((res) => {
             return Promise.resolve(res.data)
         }).catch((err) => {
             alert('错误')
         })
     }
 }