axios封装

1.安装axios

npm install axios -s

2.新建http.js文件

import axios, { AxiosInstance, AxiosRequestConfig } from "axios";
import { Message } from "element-ui";
import { jumpLogin, downloadFile } from "@/utils";
import { Loading } from "element-ui";
import { ElLoadingComponent } from "element-ui/types/loading";
// import vm from "@/main";

let loadingInstance: ElLoadingComponent | null = null;
let requestNum = 0;

const addLoading = () => {
  // 增加loading 如果pending请求数量等于1，弹出loading, 防止重复弹出
  requestNum++;
  if (requestNum == 1) {
    loadingInstance = Loading.service({
      text: "正在努力加载中....",
      background: "rgba(0, 0, 0, 0)",
    });
  }
};

const cancelLoading = () => {
  // 取消loading 如果pending请求数量等于0，关闭loading
  requestNum--;
  if (requestNum === 0) loadingInstance?.close();
};

export const createAxiosByinterceptors = (
  config?: AxiosRequestConfig
): AxiosInstance => {
  const instance = axios.create({
    timeout: 1000,    //超时配置
    withCredentials: true,  //跨域携带cookie
    ...config,   // 自定义配置覆盖基本配置
  });

  // 添加请求拦截器
  instance.interceptors.request.use(
    function (config: any) {
      // 在发送请求之前做些什么
      const { loading = true } = config;
      console.log("config:", config);
      // config.headers.Authorization = vm.$Cookies.get("vue_admin_token");
      if (loading) addLoading();
      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) {
      // 对响应数据做点什么
      console.log("response:", response);
      const { loading = true } = response.config;
      if (loading) cancelLoading();
      const { code, data, message } = response.data;
      // config设置responseType为blob 处理文件下载
      if (response.data instanceof Blob) {
        return downloadFile(response);
      } else {
        if (code === 200) return data;
        else if (code === 401) {
          jumpLogin();
        } else {
          Message.error(message);
          return Promise.reject(response.data);
        }
      }
    },
    function (error) {
      // 对响应错误做点什么
      console.log("error-response:", error.response);
      console.log("error-config:", error.config);
      console.log("error-request:", error.request);
      const { loading = true } = error.config;
      if (loading) cancelLoading();
      if (error.response) {
        if (error.response.status === 401) {
          jumpLogin();
        }
      }
      Message.error(error?.response?.data?.message || "服务端异常");
      return Promise.reject(error);
    }
  );
  return instance;
};

3.文件utils/index.js

src/utils/index.js

import { Message } from "element-ui";
import { AxiosResponse } from "axios";
import vm from "@/main";

/**
 *   跳转登录
 */
export const jumpLogin = () => {
  vm.$Cookies.remove("vue_admin_token");
  vm.$router.push(`/login?redirect=${encodeURIComponent(vm.$route.fullPath)}`);
};

/**
 * 下载文件
 * @param response
 * @returns
 */
export const downloadFile = (response) => {
  console.log("response.data.type:", response.data.type);
  return new Promise((resolve, reject) => {
    const fileReader = new FileReader();
    fileReader.onload = function () {
      try {
        console.log("result:", this.result);
        const jsonData = JSON.parse((this as any).result); // 成功 说明是普通对象数据
        if (jsonData?.code !== 200) {
          Message.error(jsonData?.message ?? "请求失败");
          reject(jsonData);
        }
      } catch (err) {
        // 解析成对象失败，说明是正常的文件流
        const blob = new Blob([response.data]);
        // 本地保存文件
        const url = window.URL.createObjectURL(blob);
        const link = document.createElement("a");
        link.href = url;
        const filename = response?.headers?.["content-disposition"]
          ?.split("filename*=")?.[1]
          ?.substr(7);
        link.setAttribute("download", decodeURI(filename));
        document.body.appendChild(link);
        link.click();
        resolve(response.data);
      }
    };
    fileReader.readAsText(response.data);
  });
};

4.使用

import { createAxiosByinterceptors } from "@/api/request";

const request = createAxiosByinterceptors({
  baseURL: localhost:7007,
});

//lodaing配置
export const appList = (params): =>
  request.get("/app", { params, loading: true }); // 不需要默认的全局loading效果可配置loading为false关闭 loading默认为true

// 文件下载
export const exportGoods = (data) =>
  request.post("/export", data, {
    responseType: "blob",
  });