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----
-title: 'get Map[@@species]'
-slug: Web/JavaScript/Reference/Global_Objects/Map/@@species
-translation_of: Web/JavaScript/Reference/Global_Objects/Map/@@species
----
-<div>{{JSRef}}</div>
-
-<p> <code><strong>Map[@@species]</strong></code> 访问器属性会返回一个 <code>Map</code> 构造函数.</p>
-
-<h2 id="语法">语法</h2>
-
-<pre class="syntaxbox">Map[Symbol.species]
-</pre>
-
-<h2 id="描述">描述</h2>
-
-<p>The species accessor property returns the default constructor for <code>Map</code> objects. Subclass constructors may over-ride it to change the constructor assignment.</p>
-
-<h2 id="案例">案例</h2>
-
-<p>The species property returns the default constructor function, which is the <code>Map</code> constructor for <code>Map</code> objects:</p>
-
-<pre class="brush: js">Map[Symbol.species]; // function Map()</pre>
-
-<p>In a derived collection object (e.g. your custom map <code>MyMap</code>), the <code>MyMap</code> species is the <code>MyMap</code> constructor. However, you might want to overwrite this, in order to return parent <code>Map</code> objects in your derived class methods:</p>
-
-<pre class="brush: js">class MyMap extends Map {
-  // 重写覆盖 MyMap species to the parent Map constructor
-  static get [Symbol.species]() { return Map; }
-}</pre>
-
-<h2 id="规范">规范</h2>
-
-<table class="standard-table">
- <tbody>
-  <tr>
-   <th scope="col">Specification</th>
-   <th scope="col">Status</th>
-   <th scope="col">Comment</th>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES2015', '#sec-get-map-@@species', 'get Map [ @@species ]')}}</td>
-   <td>{{Spec2('ES2015')}}</td>
-   <td>Initial definition.</td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-get-map-@@species', 'get Map [ @@species ]')}}</td>
-   <td>{{Spec2('ESDraft')}}</td>
-   <td> </td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-<div>
-
-
-<p>{{Compat("javascript.builtins.Map.@@species")}}</p>
-</div>
-
-<h2 id="相关链接">相关链接</h2>
-
-<ul>
- <li>{{jsxref("Map")}}</li>
- <li>{{jsxref("Symbol.species")}}</li>
-</ul>