该 ArrayBuffer[@@species] 访问器属性会返回 ArrayBuffer 构造器。

语法

ArrayBuffer[Symbol.species]

描述

这个 species 访问器属性会返回默认的 ArrayBuffer 构造器。子类构造器可能会覆盖它以改变构造器赋值。

示例

返回默认的 ArrayBuffer 构造器:

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

在派生集合对象中(比如你定制的 array buffer MyArrayBuffer),MyArrayBuffer species 就是 MyArrayBuffer 构造器。但是,你可能想要在派生类里重写它,以期返回的是父类的 ArrayBuffer 对象:

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

规范

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

浏览器支持

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome ? Edge ? Firefox Full support 48IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android Full support 48Opera Android ? Safari iOS ? Samsung Internet Android ? 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
Compatibility unknown  
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