[前端] axios网络请求二次封装

一、场景描述

为什么要对axios网络请求进行二次封装?
解决代码的复用，提高可维护性。 —这个有两个方案：一个是二次封装一个是实例化。（设置一些公共的参数，然后进行请求）
为什么可以解决代码的复用：
这是最简单格式的代码，需要定义url和请求方式。

axios({method: "get",url: "http://codercba.com:9002/banner",
}).then(function (response) {console.log(response);
}).catch(function (error) {console.log(error);
});

封装之后的请求方式，减少了点代码

    hyRequest.get({ url: "/banner" }).then((res) => {console.log(res);setImg(res.banners);console.log(img);});

Axios实例化的输出

const instance = axios.create({baseURL: "http://codercba.com:9002",
});instance.get("banner").then((response) => {console.log("实例化请求输出");console.log(response);
});

二、二次封装的代码实现

type.ts //定义一些类型

import type {InternalAxiosRequestConfig,AxiosRequestConfig,AxiosResponse,AxiosRequestHeaders,
} from "axios";export interface HYInterceptors<T = AxiosResponse> {   //定义拦截器类型requestSuccessFn?: (config: InternalAxiosRequestConfig) => InternalAxiosRequestConfig;requestFailureFn?: (err: any) => any;responseSuccessFn?: (res: T) => T;responseFailureFn?: (err: any) => any;
}export interface HYRequestConfig<T = AxiosResponse> extends AxiosRequestConfig {      //定义请求体的配置   interceptors?: HYInterceptors<T>;headers?: AxiosRequestHeaders;
}

request.ts //封装axios

import axios, { InternalAxiosRequestConfig } from "axios";
import type { AxiosInstance } from "axios";
import type { HYRequestConfig } from "./type";class HYRequest {instance: AxiosInstance;     //实例constructor(config: HYRequestConfig) {   this.instance = axios.create(config);     //实例化axiosthis.instance.interceptors.response.use((config) => {return config;},(err) => {return err;});this.instance.interceptors.response.use((res) => {return res.data;},(err) => {return err;});this.instance.interceptors.request.use(config.interceptors?.requestSuccessFn,config.interceptors?.requestFailureFn);this.instance.interceptors.response.use(config.interceptors?.responseSuccessFn,config.interceptors?.responseFailureFn);}request<T = any>(config: HYRequestConfig<T>) {if (config.interceptors?.requestSuccessFn) {config = config.interceptors.requestSuccessFn(config as InternalAxiosRequestConfig);}return new Promise<T>((resolve, reject) => {this.instance      //实例请求 .request<any, T>(config).then((res) => {if (config.interceptors?.responseSuccessFn) {res = config.interceptors.responseSuccessFn(res);}resolve(res);}).catch((err) => {reject(err);});});}get<T = any>(config: HYRequestConfig<T>) {return this.request({ ...config, method: "GET" });}post<T = any>(config: HYRequestConfig<T>) {return this.request({ ...config, method: "POST" });}delete<T = any>(config: HYRequestConfig<T>) {return this.request({ ...config, method: "DELETE" });}patch<T = any>(config: HYRequestConfig<T>) {return this.request({ ...config, method: "PATCH" });}
}export default HYRequest;

index.ts //实例化

import { BASE_URL, TIME_OUT } from "./config";
import HYRequest from "./request";const hyRequest = new HYRequest({baseURL: BASE_URL,timeout: TIME_OUT,interceptors: {requestSuccessFn: (config) => {return config;},},
});export default hyRequest;

可以看到其实封装也是先实例化之后再进行封装。为什么要这么做，实例化的东西不太好维护。包括对拦截器的更新。

三、axios相关内容