vue3.0封装axios：

vue3.0封装网络模块：

第一步：

第二步：

export const METHOD = {
  GET: "get",
  POST: "post",
  PUT: "put",
  DELETE:"delete"
};

export const PATH = {
  index: "/index.json",
  details: "/detail.json",
};

import axios from "axios";
import { METHOD } from "./config";


const instance = axios.create({
  baseURL: 'http://localhost:8080',
  timeout: 5000,

});

// let loading = null;
// 添加请求拦截器
instance.interceptors.request.use(
  function(config) {
   
    return config;
  },
  function(error) {
    // 对请求错误做些什么
    return Promise.reject(error);
  }
);

// 添加响应拦截器
instance.interceptors.response.use(
  function(response) {
 
    return response;
  },
  function(error) {
    
    // 对响应错误做点什么
    return Promise.reject(error);
  }
);

export function request(method, url, parmas) {
  switch (method) {
  case METHOD.GET:
    return GET(url, parmas);
  case METHOD.POST:
    return POST(url, parmas);
  case METHOD.PUT:
    return PUT(url, parmas)
  case METHOD.DELETE:
    return DELETE(url, parmas)
  }
}

function GET(url, params) {
  return instance.get(url, params);
}

function POST(url, params) {
  return instance.post(url, params);
}
function PUT(url, params) {
  return instance.put(url, params);
}
function DELETE(url, params) {
  return instance.delete(url, params);
}

import { METHOD, PATH } from "./config";
import { request } from "./core";

const APIClient = {
  index(params) {
    return request(METHOD.GET, PATH.index, params);
  },
  details(params) {
    return request(METHOD.GET, PATH.details, params);
  },
};

export default APIClient;

第三步：

注意2.0与3.0区别：

// import axios from 'axios'
const app = createApp(App)
// app.config.globalProperties.$axios = axios
import http from './network/index'
app.config.globalProperties.$http = http

app.use(store).use(router).use(http).use(Vant).mount('#app')

第四步：

<script>
// @ is an alias to /src
import { defineComponent, reactive, ref, getCurrentInstance } from "vue";

import Grid from "../components/Grid";

export default defineComponent({
  name: "Home",
  components: { Grid },
  setup() {
    const state = reactive({
      swiper: [],
      pop: [],
      pus: [],
      list: [],
    });
    const value = ref("");

    const { ctx } = getCurrentInstance();
    ctx.$http.index().then((res) => {
      console.log(res);
      state.swiper = res.data.data.swiperList;
      state.pop = res.data.data.recommendList;
      state.pus = res.data.data.weekendList;
      state.list = res.data.data.iconList;
    });

    const gotodetails = () => {
      ctx.$router.push({ path: "/about" });
    };

    return { state, value, gotodetails };
  },
});
</script>