uTools-Manuals/docs/javascript/Reference/Global_Objects/RegExp/@@species.html

<article id="wikiArticle">
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<p><code><strong>RegExp[@@species]</strong></code> 访问器属性返回<code>RegExp</code> 的构造器。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">RegExp[Symbol.species]
</pre>
<h2 id="描述">描述</h2>
<p><code>species</code> 访问器属性返回 <code>RegExp</code> 对象的默认构造器。子类构造器可能会覆盖它，来修改构造器的指派。</p>
<h2 id="示例">示例</h2>
<p><code>species</code>属性返回默认构造器函数，它是用于<code>RegExp</code> 对象的<code>RegExp</code>构造器：</p>
<pre class="brush: js">RegExp[Symbol.species]; // 函数 RegExp()</pre>
<p>在派生的正则类（也就是你自定义的正则类 <code>MyRegExp</code>）中，<code>MyRegExp</code> 的 species 是 <code>MyRegExp</code> 构造器。但是，你可能希望覆盖它，以便在你的派生类方法中，返回 <code>RegExp</code> 父类对象：</p>
<pre class="brush: js">class MyRegExp extends RegExp {
  // 将 MyRegExp species 覆盖为 RegExp 父类构造器
  static get [Symbol.species]() { return RegExp; }
}</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
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<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-get-regexp-@@species" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">get RegExp [ @@species ]</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>初始定义。</td>
</tr>
<tr>
<td><a class="external" href="https://tc39.github.io/ecma262/#sec-get-regexp-@@species" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">get RegExp [ @@species ]</small></a></td>
<td><span class="spec-Draft">Draft</span></td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
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<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
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<td>Basic support</td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
<td><a href="/en-US/Firefox/Releases/49" title="Released on 2016-09-13.">49</a> (49)</td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
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<div id="compat-mobile">
<table class="compat-table">
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<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
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<td>Basic support</td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
<td>49.0 (49)</td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
<td><span style="color: rgb(255, 153, 0);" title="Compatibility unknown; please update this.">?</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="另见">另见</h2>
<ul>
<li><a href="Reference/RegExp" title="此页面仍未被本地化, 期待您的翻译!"><code>RegExp</code></a></li>
<li><a href="Reference/Global_Objects/Symbol/species" title="知名的 Symbol.species 是个函数值属性，其被构造函数用以创建派生对象。"><code>Symbol.species</code></a></li>
</ul>
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