//  定义常量

export  const variantName = '哈哈哈';

export  const  Float = 3.1415926;

export  const  char = '61515';

引用常量

//我是模块二

import * as variantName from './模块一'

// * 代表  引入所有的 变量

// as 代表 别名

console.log(variantName.variantName)  //哈哈哈

console.log(variantName.Float)  //3.1415926

console.log(variantName.char)  //'61515'

//我是 模块三

import {variantName,Float } as variantName from './模块一'

console.log(variantName.variantName)  //哈哈哈

console.log(variantName.Float)  //3.1415926

//我是模块四(只用一个)

import variantName as variantName from './模块一'

console.log(variantName.variantName)  //哈哈哈