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+---
+title: handler.has()
+slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler/has
+translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/has
+---
+<div>{{JSRef}}</div>
+
+<p> <strong><code>handler.has()</code></strong> 方法是针对 {{jsxref("Operators/in", "in")}} 操作符的代理方法。</p>
+
+
+
+
+
+<p>{{EmbedInteractiveExample("pages/js/proxyhandler-has.html", "taller")}}</p>
+
+
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var p = new Proxy(target, {
+  has: function(target, prop) {
+  }
+});
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<p><code>下面是传递给 has</code> 方法的参数. <code>this</code> is bound to the handler.</p>
+
+<dl>
+ <dt><code>target</code></dt>
+ <dd>目标对象.</dd>
+ <dt><code>prop</code></dt>
+ <dd>需要检查是否存在的属性.</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p><code>has</code> 方法返回一个 boolean 属性的值.</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code><strong>handler.has</strong></code> 方法可以看作是针对 {{jsxref("Operators/in", "in")}} 操作的钩子.</p>
+
+<h3 id="拦截">拦截</h3>
+
+<p>这个钩子可以拦截下面这些操作:</p>
+
+<ul>
+ <li>属性查询: <code>foo in proxy</code></li>
+ <li>继承属性查询: <code>foo in Object.create(proxy)</code></li>
+ <li><code>with</code> 检查<code>: with(proxy) { (foo); }</code></li>
+ <li>{{jsxref("Reflect.has()")}}</li>
+</ul>
+
+<h3 id="约束">约束</h3>
+
+<p>如果违反了下面这些规则,  proxy 将会抛出 {{jsxref("TypeError")}}:</p>
+
+<ul>
+ <li>如果目标对象的某一属性本身不可被配置，则该属性不能够被代理隐藏.</li>
+ <li>如果目标对象为不可扩展对象，则该对象的属性不能够被代理隐藏</li>
+</ul>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的代码拦截了 {{jsxref("Operators/in", "in")}} 操作符.</p>
+
+<pre class="brush: js">var p = new Proxy({}, {
+  has: function(target, prop) {
+    console.log('called: ' + prop);
+    return true;
+  }
+});
+
+console.log('a' in p); // "called: a"
+                       // true
+</pre>
+
+<p>下面的代码违反了约束.</p>
+
+<pre class="brush: js">var obj = { a: 10 };
+Object.preventExtensions(obj);
+var p = new Proxy(obj, {
+  has: function(target, prop) {
+    return false;
+  }
+});
+
+'a' in p; // TypeError is thrown
+</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-hasproperty-p', '[[HasProperty]]')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots-hasproperty-p', '[[HasProperty]]')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持">浏览器支持</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="其他">其他</h2>
+
+<ul>
+ <li>{{jsxref("Proxy")}}</li>
+ <li>{{jsxref("Proxy.handler", "handler")}}</li>
+ <li>{{jsxref("Operators/in", "in")}} operator</li>
+ <li>{{jsxref("Reflect.has()")}}</li>
+</ul>