es模块化导入导出

1、导出

let num = 10;

function sum(a,b){
  return a+b
}


class Animal{
  constructor(){
    this.age = 10
  }
}

exports.num = num
exports.sum = sum
exports.Animal = Animal
或者
module.exports = {
  num,
  sum,
  Animal
}

导入

const m1 = require('./modules/m1')

console.log(m1)
console.log(m1.sum(20,6))

//拿到对象
const obj = new m1.Animal
console.log(obj.age)