import * as xxx from 的含义
参考 https://blog.csdn.net/thlzjfefe/article/details/108658206
一. 把所有的输出包裹到obj对象里
export function f1(){}
export function f2(){}
import * as Fn from './index.js'
Fn.fn1()
Fn.fn2()
二 .重命名export 和import 导入多个文件中,变量名字相同,即会产生命名冲突的问题
//test1.js
export let myName = "我来自test1"
//test2.js
export let myName = "test2"
//
import {myName as name1 } from './test1.js'
import {myName as name2} from './test2.js'

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