• CommonJs: Node.js
• AMD: require.js
• CMD: sea.js
• ES6

{
  // 导出
  export let A = 123
  export function test() {
    console.log('test')
  }
  export class Hello {
    test() {
      console.log('class')
    }
  }
}

{
  let A = 123
  let test = function () {
    console.log('test')
  }
  class Hello {
    test() {
      console.log('class')
    }
  }

  export default {
    A,
    test,
    Hello,
  }
}

// 小技巧
// import * as modules from "../../xxx"
// console.log(moudlex.xxx);