ES6 & export & export default All In One

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ES6 & export & export default All In One

export

// utils.js
export const sum = (a, b ) => a + b;

export const trim = str => str.trim();

// export 导入多个模块

// import 导入多个模块
import * as utils from './utils.js';

utils.sum(1, 2);
utils.trim(' abc ');


// console.log('sum =', utils.sum(1, 2));
// console.log('trim =', utils.trim(' abc '));

export default (one)

1. export default 匿名

// utils.js
const sum = (a, b ) => a + b;

const trim = str => str.trim();

// export default， 但是没有命名/匿名
export default {
  sum,
  trim,
};

import * as utils from './utils.js';

// console.log('utils =', utils, JSON.stringify(utils));
// utils.default
const {
    sum,
    trim,
} = utils.default;
// 使用 default

sum(1, 2);
trim(' abc ');

console.log('sum =', sum(1, 2));
console.log('trim =', trim(' abc '));

2. export default 命名

// utils.js
const sum = (a, b ) => a + b;

const trim = str => str.trim();


// export default， 命名
const utils = {
  sum,
  trim,
};

export default utils;
// 或者
export default {
  ...utils,
};

import utils from './utils.js';

// console.log('utils =', utils, JSON.stringify(utils));

const {
    sum,
    trim,
} = utils;
// 使用 default

sum(1, 2);
trim(' abc ');

console.log('sum =', sum(1, 2));
console.log('trim =', trim(' abc '));

export default (multi)

// utils.js
const sum = (a, b ) => a + b;

const trim = str => str.trim();

export default sum;
export default trim;
// ❌ 语法错误：Only one default export allowed per module.

solution

每个文件/每个模块，只允许有一个 export default 语句✅

// sum.js
const sum = (a, b ) => a + b;

export default sum;

// trim.js
const trim = str => str.trim();

export default trim;

// multi export
import sum from './sum.js';
import trim from './trim.js';

sum(1, 2);
trim(' abc ');

refs

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export

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