mpvue-dev-temp/server/controllers/index.js

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

/**
 * 映射 d 文件夹下的文件为模块
 */
const mapDir = d => {
  const tree = {}

  // 获得当前文件夹下的所有的文件夹和文件
  const [dirs, files] = _(fs.readdirSync(d)).partition(p => fs.statSync(path.join(d, p)).isDirectory())

  // 映射文件夹
  dirs.forEach(dir => {
    tree[dir] = mapDir(path.join(d, dir))
  })

  // 映射文件
  files.forEach(file => {
    if (path.extname(file) === '.js') {
      tree[path.basename(file, '.js')] = require(path.join(d, file))
    }
  })

  return tree
}

// 默认导出当前文件夹下的映射
module.exports = mapDir(path.join(__dirname))