Detailed explanation of the difference between ES6 modularity and CommonJS modularity

The difference between ES6 modularization and CommonJS modularization

In recent projects, about the import, export and export of ES6 I am confused about the use of module.exports and require in CommonJS. Today I decided to summarize it. If there is anything wrong, please give me some advice.

ES6 Modularity

import command is used to import functions provided by other modules;export## The #command is used to specify the external interface of the module.

import and export

// 导出 a.js

/** 写法一 **/
var name = 'sheep'
function getSheep() {
    name = 'hourse'
}
export {getSheep}

// 引入 b.js
import {getSheep} from '.／a.js'


/** 写法二 **/
var name = 'sheep'
export function getSheep() {
    name = 'hourse'
}

// 引入 b.js

import {getSheep} from '.／a.js'

import and export defalut

// 导出 a.js
let obj = {
    name: 'hello',
    getName: function (){
        return this.name
    }

export default obj

// 引入 b.js

import obj from './a.js'

CommonJS modularity

require and module.exports

require Supported in both ES6 (bable converts import to require) and CommonJS

// 导出 a.js

let obj = {
    name: 'hello',
    getName: function (){
        return this.name
    }

module.exports = obj

// 引入 b.js

let obj = require('./a.js')

Summary

• Even if we use the ES6 module system, if we use Babel's conversion, the ES6 module system will eventually be converted to the CommonJS specification.

• When using require in Babel5, the imported value is the value returned by module.export or the value returned by export default.

• In Babel6, when using import to introduce, you can directly get the value of export default; but if it is a component imported by require, whether the export is module.export, export, or export default, you can directly To obtain the export default value, you must add a default.

Reference:

• https://www.jianshu.com/p/27ee06296bcd

• https://juejin.im/post/5a2e5f0851882575d42f5609

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