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+---
+title: Symbol.hasInstance
+slug: Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance
+translation_of: Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance
+---
+<p>{{JSRef}}</p>
+
+<p><strong><code>Symbol.hasInstance</code></strong>用于判断某对象是否为某构造器的实例。因此你可以用它自定义 {{jsxref("Operators/instanceof", "instanceof")}} 操作符在某个类上的行为。</p>
+
+<div>
+<div>{{EmbedInteractiveExample("pages/js/symbol-hasinstance.html")}}</div>
+
+<div class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</div>
+</div>
+
+<div>{{js_property_attributes(0,0,0)}}</div>
+
+<h2 id="示例">示例</h2>
+
+<p><font face="Open Sans, Arial, sans-serif">你可实现一个自定义的</font><code>instanceof</code> 行为，<font face="Open Sans, Arial, sans-serif">例如：</font></p>
+
+<pre class="brush: js notranslate">class MyArray {
+  static [Symbol.hasInstance](instance) {
+    return Array.isArray(instance);
+  }
+}
+console.log([] instanceof MyArray); // true</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">文档</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-symbol.hasinstance', 'Symbol.hasInstance')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-symbol.hasinstance', 'Symbol.hasInstance')}}</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>
+
+<p>{{Compat("javascript.builtins.Symbol.hasInstance")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("Operators/instanceof", "instanceof")}}</li>
+</ul>