阿西河

所有教程

公众号
🌙
阿西河前端的公众号

我的收藏

    最近访问  (文章)

      教程列表

      抓包专区
      测试专区

      JavaScript get ArrayBuffer[@@species]

      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

      SpecificationStatusComment
      [ECMAScript 2015 (6th Edition, ECMA-262)
      get ArrayBuffer [ @@species ]](https://www.ecma-international.org/ecma-262/6.0/#sec-get-arraybuffer-@@species)StandardInitial definition.
      [ECMAScript Latest Draft (ECMA-262)
      get ArrayBuffer [ @@species ]](https://tc39.es/ecma262/#sec-get-arraybuffer-@@species)Draft 

      浏览器支持

      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

      DesktopMobileServer
      ChromeEdgeFirefox
      @@speciesChrome ?Edge Full support 13Firefox Full support 48
      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

      Compatibility unknown  

      Compatibility unknown

      User must explicitly enable this feature.

      User must explicitly enable this feature.

      相关

      目录
      目录