在vue2中使用.env环境(dotenv)

 .env文件

const fs = require('fs')
const path = require('path')

const NODE_ENV = process.env.NODE_ENV || 'development'

function resolve (dir) {
  // console.log(path.join(__dirname, dir))  //D:测试项目erperpuild.env
  return path.join(__dirname, '..', dir)   //.env文件的位置 D:测试项目erperp.env
}

const envFile = resolve('.env')

// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
var dotenvFiles = [
  `${envFile}.${NODE_ENV}.local`,
  `${envFile}.${NODE_ENV}`,
  // Don't include `.env.local` for `test` environment
  // since normally you expect tests to produce the same
  // results for everyone
  NODE_ENV !== 'test' && `${envFile}.local`,
  envFile,
].filter(Boolean);


if (process.env.npm_config_test) {
  dotenvFiles = [
    `${envFile}.test.local`,
    `${envFile}.test`,
    // Don't include `.env.local` for `test` environment
    // since normally you expect tests to produce the same
    // results for everyone
    NODE_ENV !== 'test' && `${envFile}.local`,
    envFile,
  ].filter(Boolean);
}

// Load environment variables from .env* files. Suppress warnings using silent
// if this file is missing. dotenv will never modify any environment variables
// that have already been set.  Variable expansion is supported in .env files.
// https://github.com/motdotla/dotenv
// https://github.com/motdotla/dotenv-expand
dotenvFiles.forEach(dotenvFile => {
  if (fs.existsSync(dotenvFile)) {
    require('dotenv-expand')(
      require('dotenv').config({
        path: dotenvFile,
      })
    );
  }
});

const reg = /^(VUE_APP_INFO)/

const raw = Object.keys(process.env)
    .filter(key => reg.test(key))
    .reduce(
      (env, key) => {
        env[key] = process.env[key];
        // console.log( env[key] ) //http://39.108.136.247:8888/erp/
        return env;
      },{}
    );

const stringified = Object.keys(raw).reduce((env, key) => {
    env[key] = JSON.stringify(raw[key]);
    // console.log( env[key] ) //"http://39.108.136.247:8888/erp/"
    return env;
  }, {})

module.exports = stringified

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