es6语法：分别暴露和统一暴露

🌰
moudule.js文件

const React = {a:1,b:2}
React.Component = class Component{

}
export default React

index.js文件

import React from './moudule.js'
/*解构赋值*/
const {Component} = React
console.log(new Component())
console.log(React)

结果：

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moudule.js文件

const React = {a:1,b:2}
React.Component = class Component{

}
/*分别暴露*/
export class Component{

}
/*统一暴露*/
export default React

index.js文件

import React,{Component} from './moudule.js'
console.log(new Component())       
console.log(React)

结果：

🌰
moudule.js文件

const React = {a:1,b:2}
React.Component = class Component{

}
// export class Component{

// }
/*统一暴露*/
export default React

index.js文件

import React,{Component} from './moudule.js'
console.log(new Component())
console.log(React)

结果：

扩展：