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+---
+title: Reflect.isExtensible()
+slug: Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible
+translation_of: Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible
+---
+<div>{{JSRef}}</div>
+
+<p><code><font face="Open Sans, Arial, sans-serif">静态方法 </font><strong>Reflect</strong></code><strong><code>.isExtensible()</code></strong> 判断一个对象是否可扩展 （即是否能够添加新的属性）。与它 {{jsxref("Object.isExtensible()")}} 方法相似，但有一些不同，详情可见 {{anch("Difference to Object.isExtensible()", "differences")}}。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Reflect.isExtensible(target)
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>target</code></dt>
+ <dd>检查是否可扩展的目标对象。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回一个 {{jsxref("Boolean")}} 值表明该对象是否可扩展。</p>
+
+<h3 id="异常">异常</h3>
+
+<p>抛出一个 {{jsxref("TypeError")}}，如果对象不是 {{jsxref("Object")}}。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>Reflect.isExtensible 判断</code>一个对象是否可扩展 （即是否能够添加新的属性）。它与 {{jsxref("Object.isExtensible()")}} 方法一样。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_Reflect.isExtensible()">使用 <code>Reflect.isExtensible()</code></h3>
+
+<p>详情可见 {{jsxref("Object.isExtensible()")}}。</p>
+
+<pre class="brush: js">// New objects are extensible.
+var empty = {};
+Reflect.isExtensible(empty); // === true
+
+// ...but that can be changed.
+Reflect.preventExtensions(empty);
+Reflect.isExtensible(empty); // === false
+
+// Sealed objects are by definition non-extensible.
+var sealed = Object.seal({});
+Reflect.isExtensible(sealed); // === false
+
+// Frozen objects are also by definition non-extensible.
+var frozen = Object.freeze({});
+Reflect.isExtensible(frozen); // === false
+</pre>
+
+<h3 id="与_Object.isExtensible()_的不同点">与 <code>Object.isExtensible() 的不同点</code></h3>
+
+<p>如果该方法的第一个参数不是一个对象（原始值），那么将造成一个 {{jsxref("TypeError")}} 异常。对于 {{jsxref("Object.isExtensible()")}}，非对象的第一个参数会被强制转换为一个对象。</p>
+
+<pre class="brush: js">Reflect.isExtensible(1);
+// TypeError: 1 is not an object
+
+Object.isExtensible(1);
+// false
+</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('ES6', '#sec-reflect.isextensible', 'Reflect.isExtensible')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-reflect.isextensible', 'Reflect.isExtensible')}}</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>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>49</td>
+   <td>{{CompatGeckoDesktop(42)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>10</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <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>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>49</td>
+   <td>{{CompatGeckoMobile(42)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>10</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Reflect")}}</li>
+ <li>{{jsxref("Object.isExtensible()")}}</li>
+</ul>