1 Index.html

2 cal.js

/** * Created by Jackey Li on 2015/7/26. */import {Hello} from './profile.js';class Calc {    constructor(){        this.hello = new Hello();        this.hello.sayHi();        console.log('Calc constructor');    }    add(a, b){        return a + b;    }}var c = new Calc();console.log(c.add(4,5));

3 profile.js

/** * Created by Jackey Li on 2015/7/26. */export class Hello{    constructor(){    }    sayHi(){        console.log('hi');    }}