get ArrayBuffer[@@species] - JavaScript 编辑

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 (ECMA-262) get ArrayBuffer [ @@species ]	Living Standard

浏览器支持

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相关

• ArrayBuffer
• Symbol.species