//导出

//方式一

export const name = 'hello'

export let addr = 'chengdu'

export var list = [1,2,3]

//方式二

const name = 'hello'

let addr = 'chengdu'

var list = [1,2,3]

export default name  //默认导出，只能有一个默认导出

export {

  //name,

  addr,

  list

}

//导入

import { name,addr,list } form './lesson-mod'

import name, { addr,list } form './lesson-mod'

import name2 form './lesson-mod' //只有默认导出的才能自己命名

import name, { addr as addr2 } form './lesson-mod' //可以利用as重命名

console.log(name,addr,list)

//导出函数,方式一

export default function say (content) {

   console.log(content)

}

export function run (){

   console.log('running')

}

//方式二

const say = (content) => {

  console.log(content)

}

const run = () => {

  console.log('running')

}

export {

   say,

   run

}

//导入函数

import say,{ run } form './xx'

say('hello word')

run()

//导出对象

const data = {

  code: 1,

  message: 'success'

}

const des = {

  age: 20,

  addr: 'chengdu'

}

export default {

   data,

   des

}

//导入

import obj from './xxx'

let {data, des} = obj

console.log(obj)

console.log(data,des)

//导出类

class Test {

  constructor () {

     this.id = 2

  }

}

export {

  Test

}

//导出默认类

export default Test

//这样写也行

export class Test {

  constructor () {

     this.id = 3

  }

}

//如果导出默认类，类名可以省略

export class {

  constructor () {

     this.id = 4

  }

}

//导入

import { Test } from 'xxx'

import Test  from 'xxx' //默认导出

let test = new Test()

console.log(test.id)

//同时导出多个类

export class Test1 {

  constructor () {

     this.id = 3

  }

}

export class Test2{

  constructor () {

     this.id = 4

  }

}

export default class people {

  constructor () {

     this.id = 11

  }

}

//导入

import * as Mod from 'xxxx'

let test1 = new mod.Test1()

console.log(test1.id)

let test2 = new mod.Test2()

console.log(test2.id)

let people = new Mod.default() //注，这里找不到people,要用default

console.log(people.id)