`Set[@@species]` 访问器属性返回`Set`的构造函数.

## 语法

    Set[Symbol.species]

## 描述

species 访问属性返回 `Set` 对象的默认构造函数. 子构造函数或许会重载这个属性以至改变构造函数的赋值.

## 示例

species 属性返回默认的构造函数, 它是`Set` 对象的构造函数:

    Set[Symbol.species]; // function Set()

在一个派生集合对象中 (比如你自定义的`MySet`集合), `MySet` 的species 属性 是 `MySet` 构造函数. 又或者, 你想要重写它, 让它能在你派生的类方法中能返回父级`Set` 对象:

    class MySet extends Set {
      // Overwrite MySet species to the parent Set constructor
      static get [Symbol.species]() { return Set; }
    }

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 2015 (6th Edition, ECMA-262) get Set [ @@species ] | Standard | Initial definition.
ECMAScript Latest Draft (ECMA-262) get Set [ @@species ] | Draft |

## 浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

| Desktop | Mobile | Server
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | Safari on iOS | Samsung Internet | Node.js
`@@species` | Chrome Full support 51 | Edge Full support 13 | Firefox Full support 41 | IE No support No | Opera Full support 38 | Safari Full support 10 | WebView Android Full support 51 | Chrome Android Full support 51 | Edge Mobile Full support 13 | Firefox Android Full support 41 | Opera Android Full support 38 | Safari iOS Full support 10 | Samsung Internet Android Full support 5.0 | nodejs Full support 6.5.0 Full support 6.5.0 Full support 6.0.0 Disabled Disabled From version 6.0.0: this feature is behind the `--harmony` runtime flag.

### Legend

Full support
  Full support
No support
  No support
User must explicitly enable this feature.
  User must explicitly enable this feature.

## 另见

- `Set`
- `Symbol.species`