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docs(module): update es2020

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ruanyf 2020-04-03 20:45:39 +08:00
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docs/module.md
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@ -540,20 +540,20 @@ export default es6;
export { default as es6 } from './someModule';
```
下面三种`import`语句，没有对应的复合写法。
ES2020 之前，有一种`import`语句，没有对应的复合写法。
```javascript
import * as someIdentifier from "someModule";
import someIdentifier from "someModule";
import someIdentifier, { namedIdentifier } from "someModule";
```
为了做到形式的对称，现在有[提案](https://github.com/leebyron/ecmascript-export-default-from)，提出补上这三种复合写法。
[ES2020](https://github.com/tc39/proposal-export-ns-from)补上了这个写法。
```javascript
export * as someIdentifier from "someModule";
export someIdentifier from "someModule";
export someIdentifier, { namedIdentifier } from "someModule";
export * as ns from "mod";
// 等同于
import * as ns from "mod";
export {ns};
```
## 模块的继承