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
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ES6模块范围
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