get Set[@@species]

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

Update compatibility data on GitHub
Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android 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 Firefox Android Full support 41 Opera Android Full support 41 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

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Full support
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User must explicitly enable this feature.

另见