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----
-title: handler.preventExtensions()
-slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler/preventExtensions
-tags:
-  - Proxy 代理 拦截
-translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/preventExtensions
----
-<div>{{JSRef}}</div>
-
-<p><strong><code>handler.preventExtensions()</code></strong> 方法用于设置对{{jsxref("Object.preventExtensions()")}}的拦截</p>
-
-<p>{{EmbedInteractiveExample("pages/js/proxyhandler-preventextensions.html", "taller")}}</p>
-
-<h2 id="语法">语法</h2>
-
-<pre class="brush: js notranslate">var p = new Proxy(target, {
-  preventExtensions: function(target) {
-  }
-});
-</pre>
-
-<h3 id="参数">参数</h3>
-
-<p>以下参数传递给 <code>preventExtensions</code> 方法. 它会绑定到这个handler.</p>
-
-<dl>
- <dt><code>target</code></dt>
- <dd>所要拦截的目标对象.</dd>
-</dl>
-
-<h3 id="返回值">返回值</h3>
-
-<p><code>preventExtensions</code> 方法返回一个布尔值.</p>
-
-<h2 id="描述">描述</h2>
-
-<p><code><strong>handler.preventExtensions()</strong></code> 拦截 {{jsxref("Object.preventExtensions()")}}返回一个布尔值.</p>
-
-<h3 id="拦截">拦截</h3>
-
-<p>这个trap可以拦截这些操作:</p>
-
-<ul>
- <li>{{jsxref("Object.preventExtensions()")}}</li>
- <li>{{jsxref("Reflect.preventExtensions()")}}</li>
-</ul>
-
-<h3 id="约束">约束</h3>
-
-<p>如果违反了下列规则, proxy则会抛出一个 {{jsxref("TypeError")}}:</p>
-
-<ul>
- <li>如果目标对象是可扩展的，那么只能返回 <code>false</code></li>
-</ul>
-
-<h2 id="示例">示例</h2>
-
-<p>以下代码演示了如何拦截{{jsxref("Object.preventExtensions()")}}。</p>
-
-<pre class="brush: js notranslate">var p = new Proxy({}, {
-  preventExtensions: function(target) {
-    console.log('called');
-    Object.preventExtensions(target);
-    return true;
-  }
-});
-
-console.log(Object.preventExtensions(p)); // "called"
-                                          // false
-</pre>
-
-<p>以下代码违反了约束.</p>
-
-<pre class="brush: js notranslate">var p = new Proxy({}, {
-  preventExtensions: function(target) {
-    return true;
-  }
-});
-
-Object.preventExtensions(p); // 抛出类型错误
-</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-proxy-object-internal-methods-and-internal-slots-preventextensions', '[[PreventExtensions]]')}}</td>
-   <td>{{Spec2('ES2015')}}</td>
-   <td>Initial definition.</td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots-preventextensions', '[[PreventExtensions]]')}}</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.Proxy.handler.preventExtensions")}}</p>
-</div>
-
-<h2 id="参考">参考</h2>
-
-<ul>
- <li>{{jsxref("Proxy")}}</li>
- <li>{{jsxref("Proxy.handler", "handler")}}</li>
- <li>{{jsxref("Object.preventExtensions()")}}</li>
- <li>{{jsxref("Reflect.preventExtensions()")}}</li>
-</ul>