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+---
+title: handler.ownKeys()
+slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler/ownKeys
+translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/ownKeys
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>handler.ownKeys()</code></strong> 方法用于拦截 {{jsxref("Reflect.ownKeys()")}}.</p>
+
+
+
+<p>{{EmbedInteractiveExample("pages/js/proxyhandler-ownkeys.html", "taller")}}</p>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var p = new Proxy(target, {
+  ownKeys: function(target) {
+  }
+});
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>下面的参数被传递给<code>ownKeys。this</code>被绑定在<code>handler上。</code></p>
+
+<dl>
+ <dt><code>target</code></dt>
+ <dd>目标对象.</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p><code>ownKeys</code> 方法必须返回一个可枚举对象.</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code><strong>handler.ownKeys()</strong></code> 方法用于拦截 {{jsxref("Reflect.ownKeys()")}}.</p>
+
+<h3 id="拦截">拦截</h3>
+
+<p>该拦截器可以拦截以下操作::</p>
+
+<ul>
+ <li>{{jsxref("Object.getOwnPropertyNames()")}}</li>
+ <li>{{jsxref("Object.getOwnPropertySymbols()")}}</li>
+ <li>{{jsxref("Object.keys()")}}</li>
+ <li>{{jsxref("Reflect.ownKeys()")}}</li>
+</ul>
+
+<h3 id="约束">约束</h3>
+
+<p>如果违反了下面的约束，proxy将抛出错误 {{jsxref("TypeError")}}:</p>
+
+<ul>
+ <li><code>ownKeys</code> 的结果必须是一个数组.</li>
+ <li>数组的元素类型要么是一个 {{jsxref("String")}} ，要么是一个 {{jsxref("Symbol")}}.</li>
+ <li>结果列表必须包含目标对象的所有不可配置（non-configurable ）、自有（own）属性的key.</li>
+ <li>如果目标对象不可扩展，那么结果列表必须包含目标对象的所有自有（own）属性的key，不能有其它值.</li>
+</ul>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的代码拦截 {{jsxref("Object.getOwnPropertyNames()")}}.</p>
+
+<pre class="brush: js">var p = new Proxy({}, {
+  ownKeys: function(target) {
+    console.log('called');
+    return ['a', 'b', 'c'];
+  }
+});
+
+console.log(Object.getOwnPropertyNames(p)); // "called"
+                                            // [ 'a', 'b', 'c' ]</pre>
+
+<p>下面的代码违反了约定</p>
+
+<pre class="brush: js example-bad">var obj = {};
+Object.defineProperty(obj, 'a', {
+  configurable: false,
+  enumerable: true,
+  value: 10 }
+);
+
+var p = new Proxy(obj, {
+  ownKeys: function(target) {
+    return [123, 12.5, true, false, undefined, null, {}, []];
+  }
+});
+
+console.log(Object.getOwnPropertyNames(p));
+
+// TypeError: proxy [[OwnPropertyKeys]] 必须返回一个数组
+// 数组元素类型只能是String或Symbol
+</pre>
+
+<h2 id="标准">标准</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-ownpropertykeys', '[[OwnPropertyKeys]]')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys', '[[OwnPropertyKeys]]')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<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>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoDesktop("18")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</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>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoMobile("18")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="兼容性注意事项">兼容性注意事项</h2>
+
+<h3 id="Firefox火狐">Firefox火狐</h3>
+
+<ul>
+ <li>在Gecko 42 {{geckoRelease(42)}}版本中, <code>ownKey</code> 的实施已经更新了，为了反映最终的ES5标准 (see {{bug(1049662)}}):
+
+  <ul>
+   <li>现在需要检查结果是不是数组以及数组元素类型是不是string或symbol.</li>
+   <li>枚举重复的自有的属性名称不再失败.</li>
+  </ul>
+ </li>
+</ul>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{jsxref("Proxy")}}</li>
+ <li>{{jsxref("Proxy.handler", "handler")}}</li>
+ <li>{{jsxref("Object.getOwnPropertyNames()")}}</li>
+ <li>{{jsxref("Reflect.ownKeys()")}}</li>
+</ul>