有以下几种导入的方式：

• import {xx} from 'xx';
• import * as xx from 'xx';
• import xx from 'xx';
• var xx = require('xx');

import {xx} from ‘xx’;

与其对应的导出是：

// 导出的3种方式
export const name = 'jack'
const age = 18
export { age }
const first = 'jim'
export { first as firstName }
// 导入
import { name as fullName, age, firstName } from 'xx';

import * as xx from ‘xx’;

// 导出
export const name = 'jack'
const age = 18
export { age }
const first = 'jim'
export { first as firstName }
// 导入
import * as user from 'xx';
// 使用
console.log(user.age) // 18

import xx from ‘xx’

// 导出
export default function() {
    console.log('haha')
}
// 导入
import Fn from 'xx';
Fn() // 'haha'

require(‘xx’)

// 导出
module.export = {
    age: 18
}
module.export.name = 'jim'
// 导入
const user = require('xx')
user.age // 18
user.name // jim