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Modularization is to make the function single, extract the functions that are not highly coupled into a single module, and each module provides a single function
export export module; import import module
module.js
export let A = 123; export function test() { return 'test'; } export class Hello { test() { console.log('class'); } }
index.js
// 1.基本用法 import {A,test,Hello} from './class/module'; console.log(A, test()); // 123 "test"
// 2.只关心某些内容 import {A} from './class/module'; console.log(A); // 123
// 3.* 和 as。* 表示导入所有,as 表示起一个别名 import * as module1 from './class/module'; console.log(module1.test()); // test
module.js
// 推荐写法 let A = 123; let test = function() { console.log('test'); }; class Hello { test() { console.log('class'); } } // default 给导出的对象不起名字,把权力交给引入方 export default { A, test, Hello }
index.js
import module2 from './class/module'; console.log(module2.A); // 123
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