process.env.VUE_APP_BASE_API 获取不到

import axios from 'axios'

// 创建axios实例
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // api的base_url
  timeout: 50000, // 请求超时时间,
})
axios.defaults.headers = {
  contentType: 'application/json',
  accept: 'text / plain',
}


export default service

.env.dev

VUE_APP_BASE_API = http://192.168.50.233:52789/api

.env.prod

VUE_APP_BASE_API = http://192.168.50.233:52789/api

package.json

 "scripts": {
    "serve": "vue-cli-service serve  --mode dev",
    "dev": "vue-cli-service serve --mode dev",
    "build": "vue-cli-service build --mode prod",
    "lint": "vue-cli-service lint"
  },

babel.config.js

module.exports = {
  "env": {
    "development": {
      "sourceMaps": true,
      "retainLines": true,
    }
  },
  presets: [
    '@vue/app'
  ]
}

文件路径如下图

最后随便在一个页面打印测试一下

ok,就可以了