es6模块化

传统的导入导出

const sum=function (a,b){
    return a+b;
}
module.exports={
    sum
}
-------------------------------
const m=require('./httpserver')
console.log(m.sum(1,2))

es6

export function sum(a,b){
    return a+b;
}
import  {sum} from   './httpserver'
console.log(sum(1,2))

　　

export default {
     sum(a,b){
    return a+b;
}
dl(){
         return a/b;
}
}