#模块

// 简单装载： 1，顶层代码会被按顺序执行一次。2，首次加载即缓存，因此常用来做预加载模块
import "module-name";

// (模块或接口)命名导入
import another-name from "module-name";
import defaultExportName as another-name from "module-name";
import { x,y as z } from "module-name";
import another-name,{x,y} from "module-name";

// 名字空间导入
import * as name-space from "module-name";

// 混用: 导入模块的默认导出，导入模块的具名导出为命名空间对象
import defaultExport, * as name-space from "module-name";

// 导出未声明
export let key1,key2=...,...,keyn;
export function fn(){}

// 导出已声明
export {key1,key2,...,keyn as default};

// 导出默认接口
export default let key1;
export default function fn(){}

// 聚合导出
export default,* as name-space from "module-name";