CommonJS(基本使用)

//CommonJS的导出
module.exports = {
  flag: true,
  test(a, b) {
    return a + b 
  },
  demo(a, b) {
    return a * b
  }
}

//CommonJS的导出
let { test, demo, flag} = require('moduleA');
//等同于
let mA = require('moduleA');
let test = mA.test;
let demo = mA.demo;
let flag = mA.flag;