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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:41:15 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:41:15 -0500
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+---
+title: Map.prototype.keys()
+slug: Web/JavaScript/Reference/Global_Objects/Map/keys
+tags:
+ - ECMAScript 2015
+ - Iterator
+ - JavaScript
+ - Map
+ - Method
+ - Prototype
+translation_of: Web/JavaScript/Reference/Global_Objects/Map/keys
+---
+<div>{{JSRef}}</div>
+
+<p>Die Methode <code><strong>keys()</strong></code> gibt ein neues <code><strong><a href="/de/docs/Web/JavaScript/Guide/Iterators_and_Generators">Iterator</a></strong></code> Objekt zurück, das die Schlüssel für alle Elemente des <code>Map</code> Objekts in der Reihenfolge des Einfügens enthält.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/map-prototype-keys.html")}}</div>
+
+
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox"><code><em>myMap</em>.keys()</code></pre>
+
+<h3 id="Rückgabewert">Rückgabewert</h3>
+
+<p>Ein neues {{jsxref("Map")}} Iterator-Objekt.</p>
+
+<h2 id="Beispiele">Beispiele</h2>
+
+<h3 id="Verwendung_von_keys">Verwendung von <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="Spezifikationen">Spezifikationen</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Spezifikation</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-map.prototype.keys', 'Map.prototype.keys')}}</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browserkompatibilität">Browserkompatibilität</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Map.keys")}}</p>
+
+<h2 id="Siehe_auch">Siehe auch</h2>
+
+<ul>
+ <li>{{jsxref("Map.prototype.entries()")}}</li>
+ <li>{{jsxref("Map.prototype.values()")}}</li>
+</ul>