使用方式：
打开Harmony第三方工具仓，找到axios，如图：

第三方工具仓网址：https://ohpm.openharmony.cn/#/cn/home
在你的项目执行命令：ohpm install @ohos/axios
前提是你已经装好了ohpm ，如果没有安装，可以在官网找到详细的安装教程；

注意：不是在你的entry目录下，比如你的项目名称：
在父级目录安装。

接着封装工具类，新建一个ts类：

import axios, { AxiosError, AxiosInstance, AxiosResponse, FormData, InternalAxiosRequestConfig } from '@ohos/axios'
import defaultAppManager from '@ohos.bundle.defaultAppManager';
import ResultData from './ResultData';


class AxiosUtil {
  private instance: AxiosInstance;

  constructor() {
    this.instance = this.getInstance();
    this.addInterceptor(this.instance)
  }

  getInstance(): AxiosInstance {
    const instance = axios.create({
       baseURL: "http://127.0.0.1:10001/jianshen"
    })
    return instance;
  }

  addInterceptor(instance: AxiosInstance): void {
    instance.interceptors.request.use((config: InternalAxiosRequestConfig) => {
      if (config.url.concat('login')) {
      	// 如果是登录路径跳过，其余都需要带上token
        return config;
      } else {
      	// 从全局缓存中取token
        config.headers.set("Authorization", AppStorage.Get("token"))
        return config;
      }
    }, (error: AxiosError) => {
      return Promise.reject(error);
    })

    instance.interceptors.response.use((response: AxiosResponse) => {
      if (response.status == 200) {
        return response.data;
      } else {
        return Promise.reject(response.statusText)
      }
    }, (error: AxiosError) => {
      return Promise.reject(error)
    })
  }

  httpGet(url: string, params: object = {}) {
    return new Promise((resolve, reject) => {
      this.instance.get(url, params)
        .then(response => {
          resolve(response);
        })
        .catch(error => {
          reject(error)
        })
    })
  }

  httpPost(url: string, params: object = {}) {
    return new Promise((resolve, reject) => {
      this.instance.post(url, params)
        .then(response => {
          resolve(response);
        })
        .catch(error => {
          reject(error)
        })
    })
  }

  httpFileUpload(url: string, formData: FormData) {
    return new Promise((resolve, reject) => {
      this.instance.post(url, formData,
        {
          headers: { 'Content-Type': 'multipart/form-data' }
        })
        .then(response => {
          resolve(response);
        })
        .catch(error => {
          reject(error)
        })
    })
  }
}

const axiosUtil: AxiosUtil = new AxiosUtil();

export default axiosUtil;

如何使用？

import axiosUtil from '../../common/AxiosUtil

然后就可以直接在你的arkts代码中使用了；例如：

// @ts-nocheck

import CommonUtil from '../../common/CommonUtil'
import ResultData from '../../common/ResultData'
import axiosUtil from '../../common/AxiosUtil'
import { Banner } from './model/Banner'
import { Teacher } from './model/Teacher'

@Component
@Preview
export default struct ShowYePage {
  @State message: string = '首页'
  private swiperController: SwiperController = new SwiperController();
  @State bannerList: Banner[] = [];
  @State teacherFilterValue: string = ''
  @State teacherList: Teacher[] = [];
  pageIndex: number = 1;
  pageSize: number = 10;
  total: number = 0;

  arr:number[] = [1,2,3,4,5,6,7,8,9,10]

  build() {
    Scroll() {
      Column() {
        Flex({ justifyContent: FlexAlign.Center }) {
          // 上面的搜索栏
          Search({ placeholder: '支持按教练名称/标签进行查询哦~' }).searchButton("搜索").onSubmit(value => {
            this.teacherFilterValue = value;
          })
        }
        .margin({ top: 14 })

        // 轮播图
        Swiper(this.swiperController) {
          if (this.bannerList.length > 0) {
            ForEach(this.bannerList, item => {
              Image(item.img).height(50).width('100%')
            })
          } else {
            Text('占位')
          }
        }
        .cachedCount(2) // 设置预加载子组件个数
        .index(1) // 设置当前在容器中显示的子组件的索引值
        .autoPlay(true) // 子组件是否自动播放
        .interval(4000) // 使用自动播放时播放的时间间隔，单位为毫秒
        .indicator(true) // 是否启用导航点指示器
        .loop(true) //  是否开启循环
        .duration(1000) // 子组件切换的动画时长，单位为毫秒
        .itemSpace(0) // 设置子组件与子组件之间间隙
        .curve(Curve.Linear) // 设置Swiper的动画曲线，默认为淡入淡出曲线
        .borderRadius(15)
        .margin({top:14})
        .height(150)
        .onChange((index: number) => {
          console.info(index.toString())
        })

        // 教练列表
        Column() {
          Flex({justifyContent:FlexAlign.Start}){
            Text('教练列表').fontSize(24).fontWeight(500).padding({left:14})
          }.height(50).width('100%')
          List() {
            ForEach(this.teacherList,(item:Teacher)=>{
              ListItem() {
                TeacherComponent({teacher:item})
              }
            })
          }
          .onReachEnd(()=>{
            console.log('触底了')
          })
          .onReachStart(()=>{
            console.log('上拉了')
          })
          .width('100%')
          .layoutWeight(1)
        }
        .borderRadius({ topLeft: 20, topRight: 20 })
        .margin({ top: 20 })
        .layoutWeight(1)
      }.height('100%').width('100%')
    }.height('100%').width('100%')

    .padding({ left: 14, right: 14 })
  }

  aboutToAppear() {
    this.getBannerList();
    this.getTeacherList();
  }
  // 支持async和await的用法 
  async getBannerList() {
    const result: Banner[] = await axiosUtil.httpPost("banner/list");
    this.bannerList = result;
  }

  async getTeacherList() {
    const params = {
      pageIndex: this.pageIndex,
      pageSize: this.pageSize,
      filterValue: this.teacherFilterValue
    }
    const result = await axiosUtil.httpPost("teacher/list", params);
    const teacherList = result.list;
    this.teacherList = teacherList;
    this.total = result.total;
  }
}


@Component
struct TeacherComponent {

  @State teacher:Teacher = null;


  build() {
    Flex({ justifyContent: FlexAlign.Center }) {
      // 左侧头像
      Flex({ justifyContent: FlexAlign.Start }) {
        Image(this.teacher.avatar).width('100%').height('100%').borderRadius(10)
      }.margin({ top: 5, bottom: 5, right: 5 }).height('95%').width('30%')
      // 右侧描述
      Flex({justifyContent:FlexAlign.Start,direction:FlexDirection.Column}) {
        Text(`教练名称:${this.teacher.username}`).fontSize(24).fontWeight(100).fontStyle(FontStyle.Italic)
        Text(`教练简介:${this.teacher.content}`).fontSize(18).fontWeight(90)
        Text(`标签:${this.teacher.flag}`).fontSize(14)
      }.margin({top:5,bottom:5,right:5}).height('100%').width('70%').onClick(()=>{
        // 跳转教练详情页面 带参数id
        console.log(this.teacher.id)
      })
    }
    .height(150)
    .width('100%')
    .borderRadius(20)
    .margin({bottom:20})
    .backgroundColor(Color.White)
  }
}

到此结束，有任何问题欢迎大佬留言指正