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+---
+title: Map.prototype.keys()
+slug: Web/JavaScript/Reference/Global_Objects/Map/keys
+translation_of: Web/JavaScript/Reference/Global_Objects/Map/keys
+---
+<div>{{JSRef}}</div>
+
+<div>O método <code><strong>keys()</strong></code> retorna um novo objeto do tipo <code><strong>Iterator</strong></code> que contem uma chave para cada elemento dentro do objeto <code>Map </code>na ordem que foram inseridos.</div>
+
+<p> </p>
+
+<h2 id="Sintaxe">Sintaxe</h2>
+
+<pre class="syntaxbox"><code><em>myMap</em>.keys()</code></pre>
+
+<h3 id="Tipo_de_Retorno">Tipo de Retorno</h3>
+
+<p>Um novo objeto {{jsxref("Map")}}.</p>
+
+<h2 id="Exemplos">Exemplos</h2>
+
+<h3 id="Usando_keys()">Usando <code>keys()</code></h3>
+
+<pre class="brush:js">var myMap = new Map();
+myMap.set("0", "foo");
+myMap.set(1, "bar");
+myMap.set({}, "baz");
+
+var mapIter = myMap.keys();
+
+console.log(mapIter.next().value); // "0"
+console.log(mapIter.next().value); // 1
+console.log(mapIter.next().value); // Object
+</pre>
+
+<h2 id="Especificações">Especificações</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-map.prototype.keys', 'Map.prototype.keys')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Definição inicial.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-map.prototype.keys', 'Map.prototype.keys')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilidade_com_navegadores">Compatibilidade com navegadores</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>38</td>
+   <td>{{CompatGeckoDesktop("20")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>25</td>
+   <td>7.1</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>{{CompatNo}}</td>
+   <td>38</td>
+   <td>{{CompatGeckoMobile("20") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>8</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Veja_também">Veja também</h2>
+
+<ul>
+ <li>{{jsxref("Map.prototype.entries()")}}</li>
+ <li>{{jsxref("Map.prototype.values()")}}</li>
+</ul>