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+---
+title: WeakSet.prototype.has()
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet/has
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/has
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>has()</strong></code> 方法根据 <code>WeakSet</code> 是否存在相应对象返回布尔值。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>ws</em>.has(value);</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>value</dt>
+ <dd>必须。 测试 <code>WeakSet 中是否存在该对象。</code></dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<dl>
+ <dt>Boolean</dt>
+ <dd>如果 <code>WeakSet</code> 对象中存在指定的元素，返回 true；否则返回 <code>false。</code></dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_has_方法">使用 <code>has</code> 方法</h3>
+
+<pre class="brush: js">var ws = new WeakSet();
+var obj = {};
+ws.add(window);
+
+mySet.has(window);  // 返回 true
+mySet.has(obj);     // 返回 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-weakset.prototype.has', 'WeakSet.prototype.has')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakset.prototype.has', 'WeakSet.prototype.has')}}</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>36</td>
+   <td>{{CompatGeckoDesktop(34)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>23</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>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>{{ CompatGeckoMobile(34) }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.add()")}}</li>
+ <li>{{jsxref("WeakSet.prototype.delete()")}}</li>
+</ul>