vue cli4下环境变量和模式的用法

NODE_ENV=development
VUE_APP_BASE_URL=http://127.0.0.1:8080/

.env        # 在所有的环境中被载入
.env.local     # 在所有的环境中被载入，但会被 git 忽略
.env.[mode]     # 只在指定的模式中被载入，优先级高于.env和.env.local
.env.[mode].local  # 只在指定的模式中被载入，但会被 git 忽略，优先级高于.env和.env.local

NODE_ENV=development
VUE_APP_BASE_URL=http://127.0.0.1:8080/

NODE_ENV=production
VUE_APP_BASE_URL=/

import Vue from 'vue'
import App from './App.vue'

// 导入axios
import axios from 'axios'
// 设置请求根路径，使用环境变量
axios.defaults.baseURL = process.env.VUE_APP_BASE_URL
// axios拦截器
axios.interceptors.request.use(config => {
 // 为请求头对象，添加Token验证的Authorization字段
 config.headers.Authorization = window.sessionStorage.getItem('token')
 // 在最后必须return config
 return config
})
// 挂载到vue
Vue.prototype.$http = axios

Vue.config.productionTip = false

new Vue({
 router,
 render: h => h(App)
}).$mount('#app')

console.log(process.env.NODE_ENV)
console.log(process.env.VUE_APP_BASE_URL)
console.log(this.$http.defaults.baseURL)

npm run serve

NODE_ENV=fat
VUE_APP_BASE_URL=http://fat.com/

{
 "name": "vue_shop",
 "version": "0.1.0",
 "private": true,
 "scripts": {
  "serve": "vue-cli-service serve",
  "build": "vue-cli-service build",
  // 这条命令是我自定义的，通过--mode指定模式为fat
  "fat": "vue-cli-service serve --mode fat",
  "lint": "vue-cli-service lint"
 },
 "dependencies": {
  "axios": "^0.19.2",
  "core-js": "^3.4.4",
  "echarts": "^4.6.0",
  "element-ui": "^2.4.5",
  "vue": "^2.6.10",
  "vue-router": "^3.1.3"
 },
 "devDependencies": {
  "@vue/cli-plugin-babel": "^4.1.0",
  "@vue/cli-plugin-eslint": "^4.1.0",
  "@vue/cli-plugin-router": "^4.1.0",
  "@vue/cli-service": "^4.1.0",
  "@vue/eslint-config-standard": "^4.0.0",
  "babel-eslint": "^10.0.3",
  "babel-plugin-component": "^1.1.1",
  "eslint": "^5.16.0",
  "eslint-plugin-vue": "^5.0.0",
  "less": "^3.10.3",
  "less-loader": "^5.0.0",
  "vue-cli-plugin-element": "^1.0.1",
  "vue-template-compiler": "^2.6.10"
 }
}

npm run fat