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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>El mètode <code><strong>has()</strong></code> retorna un booleà indicant si un objecte existeix o no en unmethod returns a boolean indicating whether an object exists in a <code>WeakSet</code> or not.</p>
+
+<h2 id="Sintaxi">Sintaxi</h2>
+
+<pre class="syntaxbox"><code><em>ws</em>.has(valor);</code></pre>
+
+<h3 id="Paràmetres">Paràmetres</h3>
+
+<dl>
+ <dt>valor</dt>
+ <dd>Necessari. L'objecte a comprovar la seva presència en <code>WeakSet</code>.</dd>
+</dl>
+
+<h3 id="Valor_de_retorn">Valor de retorn</h3>
+
+<dl>
+ <dt>Booleà</dt>
+ <dd>Retorna <code>true</code> si un element amb el valor especificat existeix en l'objecte <code>WeakSet</code>; en el cas contrari retornarà <code>false</code>.</dd>
+</dl>
+
+<h2 id="Exemples">Exemples</h2>
+
+<h3 id="Utilitzar_el_mètode_has">Utilitzar el mètode <code>has</code></h3>
+
+<pre class="brush: js">var ws = new WeakSet();
+var obj = {};
+ws.add(window);
+
+mySet.has(window); // retorna true
+mySet.has(obj); // retorna false
+</pre>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Especificació</th>
+ <th scope="col">Estat</th>
+ <th scope="col">Comentaris</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-weakset.prototype.has', 'WeakSet.prototype.has')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>Definició inicial.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilitat_amb_navegadors">Compatibilitat amb navegadors</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Característica</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Suport bàsic</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>Característica</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Suport bàsic</td>
+ <td>{{CompatNo}}</td>
+ <td>{{ CompatGeckoMobile(34) }}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Vegeu_també">Vegeu també</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.add()")}}</li>
+ <li>{{jsxref("WeakSet.prototype.delete()")}}</li>
+</ul>