需求

vue3项目，后台接口地址需要在打包后自由修改，每次修改后再打包太过麻烦

方案

public文件夹放json配置文件
main.js里读取json配置文件并修改axios全局BaseUrl，且注册全局变量
以此达到修改了axios接口地址并且能够在vue文件里自由访问接口地址的效果

实例

main.js

import {createApp} from 'vue'
import store from '@/store'
import App from './App.vue'
import router from './router/index.js'
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'
import './assets/css/material-dashboard.min.css'

import VMdEditor from '@kangc/v-md-editor';
import '@kangc/v-md-editor/lib/style/base-editor.css';
import githubTheme from '@kangc/v-md-editor/lib/theme/github.js';
import '@kangc/v-md-editor/lib/theme/style/github.css';
// highlightjs
import hljs from 'highlight.js';
import axios from 'axios'
import requests from "@/axios";
VMdEditor.use(githubTheme, {
    Hljs: hljs,
});

function getServerConfig() {
    axios.get('/config.json').then(res => { 
        const app = createApp(App)
        const server = process.env.NODE_ENV !== 'development' ? res.data.BASE_URL_PROD : res.data.BASE_URL_DEV
        requests.defaults.baseURL = server
        app.provide('server', server)
        app.use(ElementPlus).use(store).use(router).use(VMdEditor).mount('#app')
    })
}

getServerConfig()

axios/index.js

import axios from 'axios'

const requests = axios.create({
    baseURL: "",
    timeout: 15000, // 请求超时时间
    withCredentials: true
})

export default requests

如何使用

在vue文件中

import {inject} from 'vue'
console.log(inject('server'))

在接口js文件中 如api/user.js

import requests from "@/axios";
import qs from 'qs'

/**
 * 获取当前登录用户的信息
 * @returns {AxiosPromise}
 */
export function getMe() {
    return requests({
        url: '/api/user/getMe',
        method: 'get',
    })
}