ES6-模块导入或导出

一、在Node中执行ES6模块

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二、文件层级及代码

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package.json

{
  "type": "module"
}

constans.js

const APP_NAME = '在线问答系统';
const VERSION = '1.0';

export let a = 1;
let b = 2;

function getName(){
    console.log('get name')
}

export{
    APP_NAME,
    VERSION as v,
    getName
}

formatUsername.js

//格式化用户昵称，取第一个字，后面用***号代替
//name：用户昵称
export default  function(name){
    return name.substr(0,1) + "***"
}

test.js

import {APP_NAME,v} from "./utils/constants.js";
import formatUname from "./utils/formatUsername.js"

console.log("APP_NAME:",APP_NAME);
console.log("version:",v);
let uname = formatUname("张三");
console.log(uname);

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test1.js

import * as myConst from './utils/constants.js'
//调用属性
console.log("APP_NAME:",myConst.APP_NAME);

//调用方法
myConst.getName();

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