ES6模块范围

本文介绍了ES6模块范围的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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