我试图创建一个模块，导出多个ES6类。假设我有如下的目录结构:
my/
└── module/
├── Foo.js
├── Bar.js
└── index.js
Foo.js和Bar.js各自导出一个默认的ES6类:
// Foo.js
export default class Foo {
// class definition
}
// Bar.js
export default class Bar {
// class definition
}
我现在把index.js设置成这样:
import Foo from './Foo';
import Bar from './Bar';
export default {
Foo,
Bar,
}
但是，我无法导入。我希望能够做到这一点，但类没有找到:
import {Foo, Bar} from 'my/module';
在ES6模块中导出多个类的正确方法是什么?
在你的代码中试试这个:
import Foo from './Foo';
import Bar from './Bar';
// without default
export {
Foo,
Bar,
}
顺便说一下，你也可以这样做:
// bundle.js
export { default as Foo } from './Foo'
export { default as Bar } from './Bar'
export { default } from './Baz'
// and import somewhere..
import Baz, { Foo, Bar } from './bundle'
使用出口
export const MyFunction = () => {}
export const MyFunction2 = () => {}
const Var = 1;
const Var2 = 2;
export {
Var,
Var2,
}
// Then import it this way
import {
MyFunction,
MyFunction2,
Var,
Var2,
} from './foo-bar-baz';
与export default不同的是，你可以导出一些东西，并在导入它的地方应用名称:
// export default
export default class UserClass {
constructor() {}
};
// import it
import User from './user'
希望这能有所帮助:
// Export (file name: my-functions.js)
export const MyFunction1 = () => {}
export const MyFunction2 = () => {}
export const MyFunction3 = () => {}
// if using `eslint` (airbnb) then you will see warning, so do this:
const MyFunction1 = () => {}
const MyFunction2 = () => {}
const MyFunction3 = () => {}
export {MyFunction1, MyFunction2, MyFunction3};
// Import
import * as myFns from "./my-functions";
myFns.MyFunction1();
myFns.MyFunction2();
myFns.MyFunction3();
// OR Import it as Destructured
import { MyFunction1, MyFunction2, MyFunction3 } from "./my-functions";
// AND you can use it like below with brackets (Parentheses) if it's a function
// AND without brackets if it's not function (eg. variables, Objects or Arrays)
MyFunction1();
MyFunction2();
@webdeb的答案对我不起作用，我在用Babel编译ES6时遇到了一个意想不到的令牌错误，做命名默认导出。
然而，这对我来说很管用:
// Foo.js
export default Foo
...
// bundle.js
export { default as Foo } from './Foo'
export { default as Bar } from './Bar'
...
// and import somewhere..
import { Foo, Bar } from './bundle'
要导出类的实例，可以使用以下语法:
// export index.js
const Foo = require('./my/module/foo');
const Bar = require('./my/module/bar');
module.exports = {
Foo : new Foo(),
Bar : new Bar()
};
// import and run method
const {Foo,Bar} = require('module_name');
Foo.test();
// export in index.js
export { default as Foo } from './Foo';
export { default as Bar } from './Bar';
// then import both
import { Foo, Bar } from 'my/module';
对于同一个js文件中的多个类，从@wordpress/element扩展Component，你可以这样做:
// classes.js
import { Component } from '@wordpress/element';
const Class1 = class extends Component {
}
const Class2 = class extends Component {
}
export { Class1, Class2 }
并在另一个js文件中导入它们:
import { Class1, Class2 } from './classes';
