ES6模块范围 [英] ES6 module scope

问题描述

我有代码:

// lib.js
var a = "a";
export var b = "b";

// main.js
console.log(a); // "a" variable is not available in a global scope
import {b} from "lib";
console.log(a); // is "a" variable available in a global scope or only in a module scope?

模块导入后，我可以在全局范围内使用"a"变量吗?还是仅在模块范围内可用? ES6模块是否具有类似此技巧的类似工作原理:

Can I use "a" variable in a global scope after module importing or is it available only in a module scope? Will ES6 modules have a similar working principle like this trick:

// module    
exports.module1 = (function(){ var a = "a"; })(); // "a" variable is not available in a global scope

推荐答案

模块导入后，我可以在全局范围内使用"a"变量吗?还是仅在模块范围内可用?

Can I use "a" variable in a global scope after module importing or is it available only in a module scope?

仅在声明它的模块内部可用.

It's only available inside the module it was declared in.

ES6模块是否具有类似此技巧的工作原理:[...]

Will ES6 modules have a similar working principle like this trick: [...]

基本上是.

ES6具有以下范围，从顶部"到底部"的顺序:

ES6 has these kinds of scopes, order from "top" to "bottom":

• 全球范围
• 模块作用域
• 功能范围
• 块范围

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