javascript 在 ES6 中使用密钥导入需要如何更改？
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How change require to import with key in ES6?
提问by godban
I want to write require with ES6 import. In the case without a key, it is pretty easy to do:
我想用 ES6 导入编写 require。在没有钥匙的情况下，很容易做到：
var args2 = require('yargs2');-> import foo from 'bar';
var args2 = require('yargs2');-> import foo from 'bar';
But with a key, I can't find the appropriate syntax:
但是用一个键，我找不到合适的语法：
var foo = require('bar').key;
How can I do that?
我怎样才能做到这一点？
回答by lyschoening
The syntax for importing a member of a module with an aliased name is:
导入具有别名的模块成员的语法是：
import {key as foo} from 'bar';
This is equivalent to var foo = require('bar').key;
这相当于 var foo = require('bar').key;
If you want to import a member without aliasing it, the syntax is simpler:
如果要导入成员而不为其添加别名，则语法更简单：
import {foo} from 'bar';
Is equivalent to:
相当于：
var foo = require('bar').foo;
回答by Amit
var foo = require('bar').keyis identical to var bar = require('bar'); var foo = bar.key(other then the declaration of a 'bar' variable that is probably no longer needed).
var foo = require('bar').key与var bar = require('bar'); var foo = bar.key（除了可能不再需要的“bar”变量的声明）相同。
if you export an object that has a property named 'key', that would be the same in ES6 import/export.
如果导出具有名为“key”的属性的对象，则在 ES6 导入/导出中也是如此。
import bar from 'bar';
var foo = bar.key;
NoteThis assumes a default export (export default xxx) as in OP. If using a named export (export foo), the syntax to use is import {foo} from 'bar'
注意这假定默认导出 (export default xxx) 就像在 OP 中一样。如果使用命名导出 (export foo)，则使用的语法是import {foo} from 'bar'
