Vue3+TS Day33 axios封装

1、为什么要对axios进行封装，而不在项目中需要的模块直接使用axios进行网络请求？

①方便更换axios；万一axios突然不更新了，我们可以快速切换到其他网络库
②方便对网络公共逻辑进行抽取（比如loading、token等等）

2、具体封装代码如下：

封装HYRequest

import axios from 'axios'
import type { AxiosInstance, AxiosRequestConfig, AxiosResponse } from 'axios'

import { ElLoading } from 'element-plus'
import { ILoadingInstance } from 'element-plus/lib/el-loading/src/loading.type'

interface HYRequestInterceptors<T = AxiosResponse> {
  requestInterceptor?: (config: AxiosRequestConfig) => AxiosRequestConfig
  requestInterceptorCatch?: (error: any) => any
  responseInterceptor?: (res: T) => T
  responseInterceptorCatch?: (error: any) => any
}

interface HYRequestConfig<T = AxiosResponse> extends AxiosRequestConfig {
  interceptors?: HYRequestInterceptors<T>
  showLoading?: boolean
}

const DEAFULT_LOADING = true

class HYRequest {
  instance: AxiosInstance
  interceptors?: HYRequestInterceptors
  showLoading: boolean
  loading?: ILoadingInstance

  constructor(config: HYRequestConfig) {
    // 创建axios实例
    this.instance = axios.create(config)

    // 保存基本信息
    this.showLoading = config.showLoading ?? DEAFULT_LOADING
    this.interceptors = config.interceptors

    // 使用拦截器
    // 1.从config中取出的拦截器是对应的实例的拦截器
    this.instance.interceptors.request.use(
      this.interceptors?.requestInterceptor,
      this.interceptors?.requestInterceptorCatch
    )
    this.instance.interceptors.response.use(
      this.interceptors?.responseInterceptor,
      this.interceptors?.responseInterceptorCatch
    )

    // 2.添加所有实例都有的拦截器
    this.instance.interceptors.request.use(
      (config) => {
        console.log('所有实例都有的拦截器：请求成功拦截')

        if (this.showLoading) {
          this.loading = ElLoading.service({
            lock: true,
            text: '正在请求数据',
            background: 'rgba(0, 0, 0, 0.5)'
          })
        }

        return config
      },
      (err) => {
        console.log('所有实例都有的拦截器：请求失败拦截')
        return err
      }
    )
    this.instance.interceptors.response.use(
      (res) => {
        console.log('所有实例都有的拦截器：相应成功拦截')

        // 将loading移除
        setTimeout(() => {
          this.loading?.close()
        }, 3000)

        const data = res.data
        if (data.returnCode === '-1001') {
          console.log('请求失败！错误信息')
        } else {
          return data
        }
      },
      (err) => {
        console.log('所有实例都有的拦截器：响应失败拦截')
        // 将loading移除
        this.loading?.close()
        // 例子：判断不同的HttpErrorCode显示不同的错误信息
        if (err.response.status === 404) {
          console.log('404错误信息~')
        }
        return err
      }
    )
  }

  request<T>(config: HYRequestConfig<T>): Promise<T> {
    return new Promise((resolve, reject) => {
      // 1.单个请求针对请求config的处理
      if (config.interceptors?.requestInterceptor) {
        config = config.interceptors.requestInterceptor(config)
      }

      // 2.判断是否需要显示loading
      if (config.showLoading == false) {
        this.showLoading = config.showLoading
      }

      this.instance
        .request<any, T>(config)
        .then((res) => {
          // 1.单个请求对数据的处理
          if (config.interceptors?.responseInterceptor) {
            res = config.interceptors.responseInterceptor(res)
          }
          // 2.将showLoading设置为默认值，这样不会影响下一次请求
          this.showLoading = DEAFULT_LOADING

          // 3.将结果resolve返回出去
          resolve(res)
        })
        .catch((err) => {
          // 将showLoading设置为默认值，这样不会影响下一次请求
          this.showLoading = DEAFULT_LOADING
          reject(err)
          return err
        })
    })
  }

  get<T>(config: HYRequestConfig<T>): Promise<T> {
    return this.request<T>({ ...config, method: 'GET' })
  }

  post<T>(config: HYRequestConfig<T>): Promise<T> {
    return this.request<T>({ ...config, method: 'POST' })
  }

  delete<T>(config: HYRequestConfig<T>): Promise<T> {
    return this.request<T>({ ...config, method: 'DELETE' })
  }

  patch<T>(config: HYRequestConfig<T>): Promise<T> {
    return this.request<T>({ ...config, method: 'PATCH' })
  }
}

export default HYRequest

封装 hyRequest

// service 统一出口
import HYRequest from './request'
import { BASE_URL, TIME_OUT } from './request/config'

const hyRequest = new HYRequest({
  baseURL: BASE_URL,
  timeout: TIME_OUT,
  interceptors: {
    requestInterceptor: (config) => {
      // 携带token的拦截
      const token = ''
      if (token) {
        config.headers.Authorization = `Bearer ${token}`
      }
      console.log('请求成功的拦截')
      return config
    },
    requestInterceptorCatch: (err) => {
      console.log('请求失败的拦截')
      return err
    },
    responseInterceptor: (res) => {
      console.log('响应成功的拦截')
      return res
    },
    responseInterceptorCatch: (err) => {
      console.log('响应失败的拦截')
      return err
    }
  }
})

export default hyRequest

代码调用：


interface DataType {
  data: any
  returnCode: string
  success: boolean
}

hyRequest
  .get<DataType>({
    url: '/home/multidata',
    showLoading: true
  })
  .then((res) => {
    console.log(res.data)
    console.log(res.returnCode)
    console.log(res.success)
  })