Please note, this is a STATIC archive of website developer.mozilla.org from 03 Nov 2016, cach3.com does not collect or store any user information, there is no "phishing" involved.

get RegExp[@@species]

我们的志愿者还没有将这篇文章翻译为 中文 (简体)加入我们帮助完成翻译!

The RegExp[@@species] accessor property returns the RegExp constructor.

Syntax

RegExp[Symbol.species]

Description

The species accessor property returns the default constructor for RegExp objects. Subclass constructors may over-ride it to change the constructor assignment.

Examples

The species property returns the default constructor function, which is the RegExp constructor for RegExp objects:

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

In a derived collection object (e.g. your custom regexp MyRegExp), the MyRegExp species is the MyRegExp constructor. However, you might want to overwrite this, in order to return parent RegExp objects in your derived class methods:

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

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'get RegExp [ @@species ]' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'get RegExp [ @@species ]' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? 49 (49) ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? 49.0 (49) ? ? ?

See also

文档标签和贡献者

 此页面的贡献者: arai, h4writer, fscholz
 最后编辑者: arai,