實現功能:

1. 取消掉重復的請求
2. 路由跳轉可以取消上個頁面沒發送的請求
3. 統一請求方式 post get put delect格式統一
4. 封裝上傳下載
5. 統一提示實現（提供配置自定義提示）
6. 非200狀態碼 錯誤信息只提示一次
7. 大文件分片上傳的封裝，某一片上傳失敗 自動上傳2次

用法

import { axios } from '@/common/request/index'
// noMessage 是否提示
axios.post('/proxyapi/api/sys/auth/login', data, { headers: { Authorization: ''}, noMessage: true })
axios.get('/proxyapi/api/sys/auth/login-user', data, { headers: { Authorization: ''} })
// 上傳 不需要加請求頭配置已經自己加了 不需要formData 配置自己加了
// chuckSize有的話就是分片上傳 沒有的話就是普通一次上傳
// chuckSize值的單位是字節（一次上傳多大）
axios.requestFormData('url', {file:file},{chuckSize:300})
// 下載
axios.requestExcelStream('url', {})

代碼封裝

import axios from 'axios'
import qs from 'qs'
import { router } from "@/router/index";
import { message } from "ant-design-vue";
import { store } from '@/store/index'

class request {
  http = {}
  pending = new Map()
  errorStatus = {
    '400': (Message = '系統錯誤') => { message.error(Message); },
    '401': (Message = '登錄過期', router) => {
      message.error(Message);
      const timeout = setTimeout(() => {
        clearTimeout(timeout);
        store.commit({ type: 'logOut/logOut' })
        router.replace({ name: "login" });
      }, 500);
    },
    '403': (Message = '沒有權限') => {
      message.error(Message)
      const timeout = setTimeout(() => {
        clearTimeout(timeout);
        router.replace({ path: "/error", query: { title: '沒有權限', status: 403 } });
      }, 500);
    },
    '404': (Message = '地址錯誤') => { message.error(Message) },
    '500': (Message = '系統錯誤') => { message.error(Message) },
    '504': (Message = '網關超時') => { message.error(Message) },
  }
  constructor(baseURL = '', timeout = 10000, token, header = 'application/json;charset=UTF-8') {
    if (!request.instance) {
      request.instance = this
      this.pending = new Map(); // 正在進行的請求
      this.init(baseURL, timeout, token, header)
    }
    return request.instance
  }
  // 處理pending的url
  dealUrl(config = {}, type = 'request') {
    const method = config.method.toLocaleLowerCase(),
      url = config.url
    // 請求的config拼裝(pending的key)
    if (type === 'request') {
      if (['get', 'delect'].includes(method)) return `${url}?params=${JSON.stringify(config?.params)}?method=${method}`
      if (['post', 'put'].includes(method)) return `${url}?data=${JSON.stringify(config?.data)}?method=${method}`
      return ''
    }
    // 響應的config拼裝(pending的key)
    if (['get', 'delect'].includes(method)) return `${url}?params=${JSON.stringify(config?.params)}?method=${method}`
    if (['post', 'put'].includes(method)) return `${url}?data=${JSON.stringify(JSON.parse(config?.data))}?method=${method}`
    return ''
  }
  // 添加peding
  addPending(config = {}) {
    config.cancelToken = new axios.CancelToken(cancle => {
      const url = this.dealUrl(config, 'request')
      this.pending.set(url, cancle)
    })
  }
  // 取消pending
  canclePending(config = {}, type = 'request') {
    const url = this.dealUrl(config, type)
    // 去尋找pending里是否有和本次相同的請求 有的話就取消上一次請求 并且刪除pending的重復記錄
    if (!this.pending.has(url)) return
    // 取消上次請求
    this.pending.get(url)?.()
    // 刪除上次記錄
    this.pending.delete(url)
  }
  init(baseURL, timeout, token, header) {
    // 創建一個axios實例
    this.http = axios.create({
      baseURL,
      timeout,
      headers: {
        'Content-type': header,
        Authorization: token, // token
      }
    });
    this.request()
    this.response()
  }
  // 添加請求攔截器
  request() {
    // 添加請求攔截器
    this.http.interceptors.request.use(config => {
      debugger
      if (!config.headers.Authorization) {
        config.headers.Authorization = store.getters['user/getToken'] ?? ''
      }
      if (config?.ifAddPending) {
        // 取消重復請求
        this.canclePending(config)
        // 添加pending
        this.addPending(config)
      }
      // 去除請求參數中的前后空格
      const params = config?.data ?? {}
      for (let key in params) {
        if (params[key] && typeof params[key] === 'string') params[key] = params[key]?.trim()
      }
      // 普通表單形式（鍵值對）
      if (config?.headers?.['Content-type'] === 'application/x-www-form-urlencoded') {
        config.data = qs.stringify(config.data)
      }
      // // formData格式
      // if (config?.headers?.['Content-type'] === 'multipart/form-data') {
      //   const params = { ...config.data }
      //   const formData = new FormData()
      //   for (let key in params) {
      //     formData.append(key, params[key])
      //   }
      //   config.data = formData
      // }
      return config
    }, error => {
      return Promise.reject(error);
    });
  }
  // 添加響應攔截器
  response() {
    this.http.interceptors.response.use(response => {
      const { statusText, data, config } = response
      if (config?.ifAddPending) {
        // 取消pending
        this.canclePending(config, 'response')
      }
      if (statusText === "OK") {
        if (!config?.noMessage) {
          if (!data?.Success) message.error(data?.Message)
          if (data?.Success) message.success(data?.Message)
        }
        return data
      }
      return {}
    }, error => {
      // 取消pending
      for (let cb of this.pending.values()) {
        cb?.()
      }
      this.pending?.clear()
      if (error?.code === 'ERR_CANCELED') return
      if (!error?.response) return message.error('服務器斷開連接');
      const {
        data: { Success = true, Code, Message },
        status
      } = error?.response;
      if (!error?.config?.noMessage) this.errorStatus?.[status + '']?.(Message, router)
      return Promise.reject(error?.response ?? {});
    });
  }
}

export default request

import request from "./axios";
import { message } from "ant-design-vue";
import { store } from '@/store/index'
// import { watch } from 'vue'

let instance = new request('', 5000, store.getters['user/getToken'], 'application/json;charset=UTF-8')
// watch(() => store.getters['user/getToken'], (token) => {
//   instance = new request('', 5000, token, 'application/json;charset=UTF-8')
// })

export class axios {
  // 暴露出去方便 1. 切換導航時取消掉未結束的請求 2. 添加全局loading防止請求未完成時切換導航 （任選一種）
  static pending() {
    return instance.pending;
  }
  static async commonFnData(url = '', data, config = {}, method) {
    if (!url || config?.constructor?.name !== 'Object') {
      message.error("請輸入正確參數");
      return Promise.reject({ Success: false })
    }
    try {
      const res = await instance.http({
        url,
        method,
        data,
        ...config
      })
      if (res?.Success) return Promise.resolve(res)
      return Promise.reject({ Success: false, error: res })
    } catch (error) {
      return Promise.reject({ Success: false, error })
    }
  }
  static async commonFnParams(url = '', params, config = {}, method) {
    if (!url || config?.constructor?.name !== 'Object') {
      message.error("請輸入正確參數");
      return Promise.reject({ Success: false })
    }
    try {
      const res = await instance.http({
        url,
        method,
        params,
        ...config
      })
      if (res?.Success) return Promise.resolve(res)
      return Promise.reject({ Success: false, error: res })
    } catch (error) {
      return Promise.reject({ Success: false, error })
    }
  }
  static async post(url, data, config) {
    return axios.commonFnData(url, data, config, 'post')
  }
  static async put(url, data, config) {
    return axios.commonFnData(url, data, config, 'put')
  }
  static async get(url, params, config) {
    return axios.commonFnParams(url, params, config, 'get')
  }
  static async delect(url, params, config) {
    return axios.commonFnParams(url, params, config, 'delect')
  }
  // 上傳
  static async requestFormData(url, data, config = {}, method = 'post') {
    const { name, size } = data?.file,
      { file } = data,
      { chuckSize } = config,
      params = { ...data }
    // 不需要分片上傳
    if (!chuckSize || chuckSize > size) {
      // formData格式
      const formData = new FormData()
      for (let key in params) {
        formData.append(key, params[key])
      }
      return axios.commonFnData(url, formData, { ...config, headers: { 'Content-type': 'multipart/form-data' } }, method)
    }
    // 分片上傳 大文件上傳
    const chuckLen = Math.ceil(size / chuckSize)
    const uploadArr = Array.from({ length: chuckLen }).map((item, index) => {
      const result = file.slice(index * chuckSize, (index + 1) * chuckSize),
        blob = new Blob([result], { type: file?.type }),
        formData = new FormData()
      blob.name = file.name
      params.index = index
      for (let key in params) {
        if (key === 'file') formData.append('file', blob)
        else formData.append(key, params[key])
      }
      return () => axios.commonFnData(url, formData, { ...config, headers: { 'Content-type': 'multipart/form-data' } }, method)
    })
    const res = await Promise.allSettled(uploadArr?.map(item => item()))
    // 上傳失敗 重復上傳2次
    res?.map((item, index) => {
      if (item?.status === 'rejected') {
        uploadArr[index]().catch(() => {
          uploadArr[index]().then(() => {
            res[index].status = 'fulfilled'
          })
        })
      }
    })
    return res
  }
  // 獲取文件流
  static async requestExcelStream(url = '', params = {}, config = {}, method = 'get') {
    const res = await axios.commonFnParams(url, params, { responseType: 'blob', ...config }, method)
    if (res.status === 200) {
      var blob = res.data
      var reader = new FileReader()
      reader.readAsDataURL(blob) // 轉換為base64，可以直接放入a表情href
      reader.onload = function (e) {
        // 轉換完成，創建一個a標簽用于下載
        var a = document.createElement('a')
        a.download = (params && params.getStreamPage || '表格') + Date.now()
        a.href = e.target.result
        a.click()
        a.remove();
      }
    }
  }
}