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enthalten.</a></p></div></div><div class="main-wrapper"><div class="sidebar-container"><aside id="sidebar-quicklinks" class="sidebar" data-macro="JSRef"><button type="button" class="button action backdrop" aria-label="Collapse sidebar"><span class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In diesem Artikel</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#probieren_sie_es_aus">Probieren Sie es aus</a></li><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beschreibung">Beschreibung</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beispiele">Beispiele</a></li><li class="document-toc-item "><a class="document-toc-link" href="#spezifikationen">Spezifikationen</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser-kompatibilität">Browser-Kompatibilität</a></li><li class="document-toc-item "><a class="document-toc-link" href="#siehe_auch">Siehe auch</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects">Globale Objekte</a></li><li class="section"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a></li><li><details open=""><summary>Konstruktor</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/Object"><code>Object() Konstruktor</code></a></li></ol></details></li><li><details open=""><summary>Statische Methoden</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/assign"><code>Object.assign()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/create"><code>Object.create()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties"><code>Object.defineProperties()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty"><code>Object.defineProperty()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/entries"><code>Object.entries()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze"><code>Object.freeze()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries"><code>Object.fromEntries()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor"><code>Object.getOwnPropertyDescriptor()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptors"><code>Object.getOwnPropertyDescriptors()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames"><code>Object.getOwnPropertyNames()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols"><code>Object.getOwnPropertySymbols()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf"><code>Object.getPrototypeOf()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy"><code>Object.groupBy()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn"><code>Object.hasOwn()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/is"><code>Object.is()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible"><code>Object.isExtensible()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen"><code>Object.isFrozen()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed"><code>Object.isSealed()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/keys"><code>Object.keys()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions"><code>Object.preventExtensions()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/seal"><code>Object.seal()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf"><code>Object.setPrototypeOf()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/values"><code>Object.values()</code></a></li></ol></details></li><li><details open=""><summary>Instanzmethoden</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__"><code>Object.prototype.__defineGetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__"><code>Object.prototype.__defineSetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__"><code>Object.prototype.__lookupGetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__"><code>Object.prototype.__lookupSetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><em><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty" aria-current="page"><code>Object.prototype.hasOwnProperty()</code></a></em></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf"><code>Object.prototype.isPrototypeOf()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable"><code>Object.prototype.propertyIsEnumerable()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString"><code>Object.prototype.toLocaleString()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString"><code>Object.prototype.toString()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details open=""><summary>Instanzeigenschaften</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor"><code>Object.prototype.constructor</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto"><code>Object.prototype.__proto__</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li></ol></details></li><li class="section no-link">Vererbung</li><li class="section"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object/Function</code></a></li><li><details><summary>Statische Methoden</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/apply"><code>Function.prototype.apply()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/bind"><code>Function.prototype.bind()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/call"><code>Function.prototype.call()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance"><code>Function.prototype[Symbol.hasInstance]()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/toString"><code>Function.prototype.toString()</code></a></li></ol></details></li><li><details><summary>Statische Eigenschaften</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/arguments"><code>Function.prototype.arguments</code></a><abbr class="icon icon-nonstandard" title="Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden."> <span class="visually-hidden">Nicht standardisiert</span> </abbr><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/caller"><code>Function.prototype.caller</code></a><abbr class="icon icon-nonstandard" title="Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden."> <span class="visually-hidden">Nicht standardisiert</span> </abbr><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/displayName"><code>Function: displayName</code></a><abbr class="icon icon-nonstandard" title="Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden."> <span class="visually-hidden">Nicht standardisiert</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/length"><code>Function: length</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/name"><code>Function: name</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype"><code>Function: prototype</code></a></li></ol></details></li><li><details open=""><summary>Instanzmethoden</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__"><code>Object.prototype.__defineGetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__"><code>Object.prototype.__defineSetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__"><code>Object.prototype.__lookupGetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__"><code>Object.prototype.__lookupSetter__()</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><em><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty" aria-current="page"><code>Object.prototype.hasOwnProperty()</code></a></em></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf"><code>Object.prototype.isPrototypeOf()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable"><code>Object.prototype.propertyIsEnumerable()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString"><code>Object.prototype.toLocaleString()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString"><code>Object.prototype.toString()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details><summary>Instanzeigenschaften</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor"><code>Object.prototype.constructor</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto"><code>Object.prototype.__proto__</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In diesem Artikel</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#probieren_sie_es_aus">Probieren Sie es aus</a></li><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beschreibung">Beschreibung</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beispiele">Beispiele</a></li><li class="document-toc-item "><a class="document-toc-link" href="#spezifikationen">Spezifikationen</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser-kompatibilität">Browser-Kompatibilität</a></li><li class="document-toc-item "><a class="document-toc-link" href="#siehe_auch">Siehe auch</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="de"><header><h1>Object.prototype.hasOwnProperty()</h1><details class="baseline-indicator high"><summary><span class="indicator" role="img" aria-label="Baseline Check"></span><h2>Baseline <span class="not-bold">Widely available</span></h2><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Supported in Firefox"><span class="browser firefox supported" role="img" aria-label="Firefox check"></span></span><span class="engine" title="Supported in Safari"><span class="browser safari supported" role="img" aria-label="Safari check"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.</p><ul><li><a href="/de/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#browser-kompatibilität" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fde%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FhasOwnProperty&level=high" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><p>Die <strong><code>hasOwnProperty()</code></strong> Methode von <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a> Instanzen gibt einen Boolean zurück, der anzeigt, ob dieses Objekt die angegebene Eigenschaft als eigene Eigenschaft hat (im Gegensatz dazu, sie zu erben).</p> <blockquote> <p><strong>Note:</strong> <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn"><code>Object.hasOwn()</code></a> wird über <code>hasOwnProperty()</code> empfohlen, in Browsern, die es unterstützen.</p> </blockquote></div><section aria-labelledby="probieren_sie_es_aus"><h2 id="probieren_sie_es_aus"><a href="#probieren_sie_es_aus">Probieren Sie es aus</a></h2><div class="section-content"><iframe class="interactive is-js-height" height="200" src="https://interactive-examples.mdn.mozilla.net/pages/js/object-prototype-hasownproperty.html" title="MDN Web Docs Interactive Example" allow="clipboard-write" loading="lazy"></iframe></div></section><section aria-labelledby="syntax"><h2 id="syntax"><a href="#syntax">Syntax</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>hasOwnProperty(prop) </code></pre></div></div></section><section aria-labelledby="parameter"><h3 id="parameter"><a href="#parameter">Parameter</a></h3><div class="section-content"><dl> <dt id="prop"><a href="#prop"><code>prop</code></a></dt> <dd> <p>Der <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/String"><code>String</code></a> Name oder das <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol">Symbol</a> der zu testenden Eigenschaft.</p> </dd> </dl></div></section><section aria-labelledby="rückgabewert"><h3 id="rückgabewert"><a href="#rückgabewert">Rückgabewert</a></h3><div class="section-content"><p>Gibt <code>true</code> zurück, wenn das Objekt die angegebene Eigenschaft als eigene Eigenschaft hat; andernfalls <code>false</code>.</p></div></section><section aria-labelledby="beschreibung"><h2 id="beschreibung"><a href="#beschreibung">Beschreibung</a></h2><div class="section-content"><p>Die <strong><code>hasOwnProperty()</code></strong> Methode gibt <code>true</code> zurück, wenn die angegebene Eigenschaft eine direkte Eigenschaft des Objekts ist — selbst wenn der Wert <code>null</code> oder <code>undefined</code> ist. Die Methode gibt <code>false</code> zurück, wenn die Eigenschaft geerbt ist oder gar nicht erklärt wurde. Im Gegensatz zum <a href="/de/docs/Web/JavaScript/Reference/Operators/in"><code>in</code></a> Operator prüft diese Methode nicht die angegebene Eigenschaft in der Prototypenkette des Objekts.</p> <p>Die Methode kann auf <em>den meisten</em> JavaScript-Objekten aufgerufen werden, da die meisten Objekte von <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a> abstammen und somit dessen Methoden erben. Zum Beispiel ist <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array"><code>Array</code></a> ein <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a>, sodass Sie die <code>hasOwnProperty()</code> Methode verwenden können, um zu prüfen, ob ein Index existiert:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const fruits = ["Apple", "Banana", "Watermelon", "Orange"]; fruits.hasOwnProperty(3); // true ('Orange') fruits.hasOwnProperty(4); // false - not defined </code></pre></div> <p>Die Methode wird nicht verfügbar sein in Objekten, wo sie neu implementiert wird, oder auf <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects"><code>null</code>-Prototyp-Objekten</a> (da diese nicht von <code>Object.prototype</code> erben). Beispiele für diese Fälle werden unten gegeben.</p></div></section><section aria-labelledby="beispiele"><h2 id="beispiele"><a href="#beispiele">Beispiele</a></h2><div class="section-content"></div></section><section aria-labelledby="verwendung_von_hasownproperty_zur_überprüfung_auf_das_vorhandensein_einer_eigenen_eigenschaft"><h3 id="verwendung_von_hasownproperty_zur_überprüfung_auf_das_vorhandensein_einer_eigenen_eigenschaft"><a href="#verwendung_von_hasownproperty_zur_überprüfung_auf_das_vorhandensein_einer_eigenen_eigenschaft">Verwendung von hasOwnProperty zur Überprüfung auf das Vorhandensein einer eigenen Eigenschaft</a></h3><div class="section-content"><p>Der folgende Code zeigt, wie man feststellt, ob das <code>example</code> Objekt eine Eigenschaft namens <code>prop</code> enthält.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const example = {}; example.hasOwnProperty("prop"); // false example.prop = "exists"; example.hasOwnProperty("prop"); // true - 'prop' has been defined example.prop = null; example.hasOwnProperty("prop"); // true - own property exists with value of null example.prop = undefined; example.hasOwnProperty("prop"); // true - own property exists with value of undefined </code></pre></div></div></section><section aria-labelledby="direkte_vs._geerbte_eigenschaften"><h3 id="direkte_vs._geerbte_eigenschaften"><a href="#direkte_vs._geerbte_eigenschaften">Direkte vs. geerbte Eigenschaften</a></h3><div class="section-content"><p>Das folgende Beispiel unterscheidet zwischen direkten Eigenschaften und Eigenschaften, die durch die Prototypenkette geerbt werden:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const example = {}; example.prop = "exists"; // `hasOwnProperty` will only return true for direct properties: example.hasOwnProperty("prop"); // true example.hasOwnProperty("toString"); // false example.hasOwnProperty("hasOwnProperty"); // false // The `in` operator will return true for direct or inherited properties: "prop" in example; // true "toString" in example; // true "hasOwnProperty" in example; // true </code></pre></div></div></section><section aria-labelledby="iterieren_über_die_eigenschaften_eines_objekts"><h3 id="iterieren_über_die_eigenschaften_eines_objekts"><a href="#iterieren_über_die_eigenschaften_eines_objekts">Iterieren über die Eigenschaften eines Objekts</a></h3><div class="section-content"><p>Das folgende Beispiel zeigt, wie man über die aufzählbaren Eigenschaften eines Objekts iteriert, ohne geerbte Eigenschaften auszuführen.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const buz = { fog: "stack", }; for (const name in buz) { if (buz.hasOwnProperty(name)) { console.log(`this is fog (${name}) for sure. Value: ${buz[name]}`); } else { console.log(name); // toString or something else } } </code></pre></div> <p>Beachten Sie, dass die <a href="/de/docs/Web/JavaScript/Reference/Statements/for...in"><code>for...in</code></a> Schleife nur über aufzählbare Elemente iteriert: das Fehlen von nicht aufzählbaren Eigenschaften, die von der Schleife ausgegeben werden, impliziert nicht, dass <code>hasOwnProperty</code> selbst strikt auf aufzählbare Elemente beschränkt ist. Sie können über nicht aufzählbare Eigenschaften mit <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames"><code>Object.getOwnPropertyNames()</code></a> iterieren.</p></div></section><section aria-labelledby="nutzung_von_hasownproperty_als_eigenschaftsname"><h3 id="nutzung_von_hasownproperty_als_eigenschaftsname"><a href="#nutzung_von_hasownproperty_als_eigenschaftsname">Nutzung von hasOwnProperty als Eigenschaftsname</a></h3><div class="section-content"><p>JavaScript schützt den Eigenschaftsnamen <code>hasOwnProperty</code> nicht; ein Objekt, das eine Eigenschaft mit diesem Namen hat, kann falsche Ergebnisse zurückgeben:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const foo = { hasOwnProperty() { return false; }, bar: "Here be dragons", }; foo.hasOwnProperty("bar"); // re-implementation always returns false </code></pre></div> <p>Die empfohlene Methode, um dieses Problem zu umgehen, ist stattdessen die Verwendung von <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn"><code>Object.hasOwn()</code></a> (in Browsern, die es unterstützen). Andere Alternativen beinhalten die Verwendung eines <em>externen</em> <code>hasOwnProperty</code>:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const foo = { bar: "Here be dragons" }; // Use Object.hasOwn() method - recommended Object.hasOwn(foo, "bar"); // true // Use the hasOwnProperty property from the Object prototype Object.prototype.hasOwnProperty.call(foo, "bar"); // true // Use another Object's hasOwnProperty // and call it with 'this' set to foo ({}).hasOwnProperty.call(foo, "bar"); // true </code></pre></div> <p>Beachten Sie, dass in den ersten beiden Fällen keine neu erzeugten Objekte vorhanden sind.</p></div></section><section aria-labelledby="objekte_die_mit_object.createnull_erstellt_wurden"><h3 id="objekte_die_mit_object.createnull_erstellt_wurden"><a href="#objekte_die_mit_object.createnull_erstellt_wurden">Objekte, die mit Object.create(null) erstellt wurden</a></h3><div class="section-content"><p><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects"><code>null</code>-Prototyp-Objekte</a> erben nicht von <code>Object.prototype</code>, wodurch <code>hasOwnProperty()</code> unzugänglich ist.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const foo = Object.create(null); foo.prop = "exists"; foo.hasOwnProperty("prop"); // Uncaught TypeError: foo.hasOwnProperty is not a function </code></pre></div> <p>Die Lösungen in diesem Fall sind die gleichen wie im vorherigen Abschnitt: Verwenden Sie bevorzugt <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn"><code>Object.hasOwn()</code></a>, andernfalls verwenden Sie das <code>hasOwnProperty()</code> eines externen Objekts.</p></div></section><h2 id="spezifikationen"><a href="#spezifikationen">Spezifikationen</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-object.prototype.hasownproperty">ECMAScript Language Specification <br/><small># sec-object.prototype.hasownproperty</small></a></td></tr></tbody></table><h2 id="browser-kompatibilität"><a href="#browser-kompatibilität">Browser-Kompatibilität</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="siehe_auch"><h2 id="siehe_auch"><a href="#siehe_auch">Siehe auch</a></h2><div class="section-content"><ul> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn"><code>Object.hasOwn()</code></a></li> <li><a href="/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">Aufzählbarkeit und Eigentümerschaft von Eigenschaften</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames"><code>Object.getOwnPropertyNames()</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Statements/for...in"><code>for...in</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Operators/in"><code>in</code></a></li> <li><a href="/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain">Vererbung und die Prototypenkette</a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div 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Content available under <a href="/de/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"Object.prototype.hasOwnProperty()","mdn_url":"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty","locale":"de","native":"Deutsch","browserCompat":["javascript.builtins.Object.hasOwnProperty"],"baseline":{"baseline":"high","baseline_high_date":"2018-01-29","baseline_low_date":"2015-07-29","support":{"chrome":"1","chrome_android":"18","edge":"12","firefox":"1","firefox_android":"4","safari":"1","safari_ios":"1"}},"sidebarHTML":"<ol><li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects\">Globale Objekte</a></li><li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a></li><li><details open=\"\"><summary>Konstruktor</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/Object\"><code>Object() Konstruktor</code></a></li></ol></details></li><li><details open=\"\"><summary>Statische Methoden</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/assign\"><code>Object.assign()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/create\"><code>Object.create()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties\"><code>Object.defineProperties()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty\"><code>Object.defineProperty()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/entries\"><code>Object.entries()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze\"><code>Object.freeze()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries\"><code>Object.fromEntries()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor\"><code>Object.getOwnPropertyDescriptor()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptors\"><code>Object.getOwnPropertyDescriptors()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames\"><code>Object.getOwnPropertyNames()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols\"><code>Object.getOwnPropertySymbols()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf\"><code>Object.getPrototypeOf()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy\"><code>Object.groupBy()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn\"><code>Object.hasOwn()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/is\"><code>Object.is()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible\"><code>Object.isExtensible()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen\"><code>Object.isFrozen()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed\"><code>Object.isSealed()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/keys\"><code>Object.keys()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions\"><code>Object.preventExtensions()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/seal\"><code>Object.seal()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf\"><code>Object.setPrototypeOf()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/values\"><code>Object.values()</code></a></li></ol></details></li><li><details open=\"\"><summary>Instanzmethoden</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__\"><code>Object.prototype.__defineGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__\"><code>Object.prototype.__defineSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__\"><code>Object.prototype.__lookupGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__\"><code>Object.prototype.__lookupSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><em><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty\" aria-current=\"page\"><code>Object.prototype.hasOwnProperty()</code></a></em></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf\"><code>Object.prototype.isPrototypeOf()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable\"><code>Object.prototype.propertyIsEnumerable()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString\"><code>Object.prototype.toLocaleString()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString\"><code>Object.prototype.toString()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf\"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details open=\"\"><summary>Instanzeigenschaften</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor\"><code>Object.prototype.constructor</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto\"><code>Object.prototype.__proto__</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li></ol></details></li><li class=\"section no-link\">Vererbung</li><li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object/Function</code></a></li><li><details><summary>Statische Methoden</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/apply\"><code>Function.prototype.apply()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/bind\"><code>Function.prototype.bind()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/call\"><code>Function.prototype.call()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance\"><code>Function.prototype[Symbol.hasInstance]()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/toString\"><code>Function.prototype.toString()</code></a></li></ol></details></li><li><details><summary>Statische Eigenschaften</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/arguments\"><code>Function.prototype.arguments</code></a><abbr class=\"icon icon-nonstandard\" title=\"Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden.\">\n <span class=\"visually-hidden\">Nicht standardisiert</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/caller\"><code>Function.prototype.caller</code></a><abbr class=\"icon icon-nonstandard\" title=\"Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden.\">\n <span class=\"visually-hidden\">Nicht standardisiert</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/displayName\"><code>Function: displayName</code></a><abbr class=\"icon icon-nonstandard\" title=\"Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden.\">\n <span class=\"visually-hidden\">Nicht standardisiert</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/length\"><code>Function: length</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/name\"><code>Function: name</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype\"><code>Function: prototype</code></a></li></ol></details></li><li><details open=\"\"><summary>Instanzmethoden</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__\"><code>Object.prototype.__defineGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__\"><code>Object.prototype.__defineSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__\"><code>Object.prototype.__lookupGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__\"><code>Object.prototype.__lookupSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><em><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty\" aria-current=\"page\"><code>Object.prototype.hasOwnProperty()</code></a></em></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf\"><code>Object.prototype.isPrototypeOf()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable\"><code>Object.prototype.propertyIsEnumerable()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString\"><code>Object.prototype.toLocaleString()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString\"><code>Object.prototype.toString()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf\"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details><summary>Instanzeigenschaften</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor\"><code>Object.prototype.constructor</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto\"><code>Object.prototype.__proto__</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li></ol></details></li></ol>","sidebarMacro":"JSRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>Die <strong><code>hasOwnProperty()</code></strong> Methode von <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a> Instanzen gibt einen Boolean zurück, der anzeigt, ob dieses Objekt die angegebene Eigenschaft als eigene Eigenschaft hat (im Gegensatz dazu, sie zu erben).</p>\n<blockquote>\n <p><strong>Note:</strong> <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn\"><code>Object.hasOwn()</code></a> wird über <code>hasOwnProperty()</code> empfohlen, in Browsern, die es unterstützen.</p>\n</blockquote>"}},{"type":"prose","value":{"id":"probieren_sie_es_aus","title":"Probieren Sie es aus","isH3":false,"content":"<iframe class=\"interactive is-js-height\" height=\"200\" src=\"https://interactive-examples.mdn.mozilla.net/pages/js/object-prototype-hasownproperty.html\" title=\"MDN Web Docs Interactive Example\" allow=\"clipboard-write\" loading=\"lazy\"></iframe>"}},{"type":"prose","value":{"id":"syntax","title":"Syntax","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>hasOwnProperty(prop)\n</code></pre></div>"}},{"type":"prose","value":{"id":"parameter","title":"Parameter","isH3":true,"content":"<dl>\n <dt id=\"prop\"><a href=\"#prop\"><code>prop</code></a></dt>\n <dd>\n <p>Der <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/String\"><code>String</code></a> Name oder das <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol\">Symbol</a> der zu testenden Eigenschaft.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"rückgabewert","title":"Rückgabewert","isH3":true,"content":"<p>Gibt <code>true</code> zurück, wenn das Objekt die angegebene Eigenschaft als eigene Eigenschaft hat; andernfalls <code>false</code>.</p>"}},{"type":"prose","value":{"id":"beschreibung","title":"Beschreibung","isH3":false,"content":"<p>Die <strong><code>hasOwnProperty()</code></strong> Methode gibt <code>true</code> zurück, wenn die angegebene Eigenschaft eine direkte Eigenschaft des Objekts ist — selbst wenn der Wert <code>null</code> oder <code>undefined</code> ist. Die Methode gibt <code>false</code> zurück, wenn die Eigenschaft geerbt ist oder gar nicht erklärt wurde. Im Gegensatz zum <a href=\"/de/docs/Web/JavaScript/Reference/Operators/in\"><code>in</code></a> Operator prüft diese Methode nicht die angegebene Eigenschaft in der Prototypenkette des Objekts.</p>\n<p>Die Methode kann auf <em>den meisten</em> JavaScript-Objekten aufgerufen werden, da die meisten Objekte von <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a> abstammen und somit dessen Methoden erben. Zum Beispiel ist <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array\"><code>Array</code></a> ein <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a>, sodass Sie die <code>hasOwnProperty()</code> Methode verwenden können, um zu prüfen, ob ein Index existiert:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const fruits = [\"Apple\", \"Banana\", \"Watermelon\", \"Orange\"];\nfruits.hasOwnProperty(3); // true ('Orange')\nfruits.hasOwnProperty(4); // false - not defined\n</code></pre></div>\n<p>Die Methode wird nicht verfügbar sein in Objekten, wo sie neu implementiert wird, oder auf <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects\"><code>null</code>-Prototyp-Objekten</a> (da diese nicht von <code>Object.prototype</code> erben). Beispiele für diese Fälle werden unten gegeben.</p>"}},{"type":"prose","value":{"id":"beispiele","title":"Beispiele","isH3":false,"content":""}},{"type":"prose","value":{"id":"verwendung_von_hasownproperty_zur_überprüfung_auf_das_vorhandensein_einer_eigenen_eigenschaft","title":"Verwendung von hasOwnProperty zur Überprüfung auf das Vorhandensein einer eigenen Eigenschaft","isH3":true,"content":"<p>Der folgende Code zeigt, wie man feststellt, ob das <code>example</code> Objekt eine Eigenschaft namens <code>prop</code> enthält.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const example = {};\nexample.hasOwnProperty(\"prop\"); // false\n\nexample.prop = \"exists\";\nexample.hasOwnProperty(\"prop\"); // true - 'prop' has been defined\n\nexample.prop = null;\nexample.hasOwnProperty(\"prop\"); // true - own property exists with value of null\n\nexample.prop = undefined;\nexample.hasOwnProperty(\"prop\"); // true - own property exists with value of undefined\n</code></pre></div>"}},{"type":"prose","value":{"id":"direkte_vs._geerbte_eigenschaften","title":"Direkte vs. geerbte Eigenschaften","isH3":true,"content":"<p>Das folgende Beispiel unterscheidet zwischen direkten Eigenschaften und Eigenschaften, die durch die Prototypenkette geerbt werden:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const example = {};\nexample.prop = \"exists\";\n\n// `hasOwnProperty` will only return true for direct properties:\nexample.hasOwnProperty(\"prop\"); // true\nexample.hasOwnProperty(\"toString\"); // false\nexample.hasOwnProperty(\"hasOwnProperty\"); // false\n\n// The `in` operator will return true for direct or inherited properties:\n\"prop\" in example; // true\n\"toString\" in example; // true\n\"hasOwnProperty\" in example; // true\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_die_eigenschaften_eines_objekts","title":"Iterieren über die Eigenschaften eines Objekts","isH3":true,"content":"<p>Das folgende Beispiel zeigt, wie man über die aufzählbaren Eigenschaften eines Objekts iteriert, ohne geerbte Eigenschaften auszuführen.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const buz = {\n fog: \"stack\",\n};\n\nfor (const name in buz) {\n if (buz.hasOwnProperty(name)) {\n console.log(`this is fog (${name}) for sure. Value: ${buz[name]}`);\n } else {\n console.log(name); // toString or something else\n }\n}\n</code></pre></div>\n<p>Beachten Sie, dass die <a href=\"/de/docs/Web/JavaScript/Reference/Statements/for...in\"><code>for...in</code></a> Schleife nur über aufzählbare Elemente iteriert: das Fehlen von nicht aufzählbaren Eigenschaften, die von der Schleife ausgegeben werden, impliziert nicht, dass <code>hasOwnProperty</code> selbst strikt auf aufzählbare Elemente beschränkt ist. Sie können über nicht aufzählbare Eigenschaften mit <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames\"><code>Object.getOwnPropertyNames()</code></a> iterieren.</p>"}},{"type":"prose","value":{"id":"nutzung_von_hasownproperty_als_eigenschaftsname","title":"Nutzung von hasOwnProperty als Eigenschaftsname","isH3":true,"content":"<p>JavaScript schützt den Eigenschaftsnamen <code>hasOwnProperty</code> nicht; ein Objekt, das eine Eigenschaft mit diesem Namen hat, kann falsche Ergebnisse zurückgeben:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const foo = {\n hasOwnProperty() {\n return false;\n },\n bar: \"Here be dragons\",\n};\n\nfoo.hasOwnProperty(\"bar\"); // re-implementation always returns false\n</code></pre></div>\n<p>Die empfohlene Methode, um dieses Problem zu umgehen, ist stattdessen die Verwendung von <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn\"><code>Object.hasOwn()</code></a> (in Browsern, die es unterstützen). Andere Alternativen beinhalten die Verwendung eines <em>externen</em> <code>hasOwnProperty</code>:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const foo = { bar: \"Here be dragons\" };\n\n// Use Object.hasOwn() method - recommended\nObject.hasOwn(foo, \"bar\"); // true\n\n// Use the hasOwnProperty property from the Object prototype\nObject.prototype.hasOwnProperty.call(foo, \"bar\"); // true\n\n// Use another Object's hasOwnProperty\n// and call it with 'this' set to foo\n({}).hasOwnProperty.call(foo, \"bar\"); // true\n</code></pre></div>\n<p>Beachten Sie, dass in den ersten beiden Fällen keine neu erzeugten Objekte vorhanden sind.</p>"}},{"type":"prose","value":{"id":"objekte_die_mit_object.createnull_erstellt_wurden","title":"Objekte, die mit Object.create(null) erstellt wurden","isH3":true,"content":"<p><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects\"><code>null</code>-Prototyp-Objekte</a> erben nicht von <code>Object.prototype</code>, wodurch <code>hasOwnProperty()</code> unzugänglich ist.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const foo = Object.create(null);\nfoo.prop = \"exists\";\nfoo.hasOwnProperty(\"prop\"); // Uncaught TypeError: foo.hasOwnProperty is not a function\n</code></pre></div>\n<p>Die Lösungen in diesem Fall sind die gleichen wie im vorherigen Abschnitt: Verwenden Sie bevorzugt <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn\"><code>Object.hasOwn()</code></a>, andernfalls verwenden Sie das <code>hasOwnProperty()</code> eines externen Objekts.</p>"}},{"type":"specifications","value":{"title":"Spezifikationen","id":"spezifikationen","isH3":false,"specifications":[{"bcdSpecificationURL":"https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-object.prototype.hasownproperty","title":"ECMAScript Language Specification"}],"query":"javascript.builtins.Object.hasOwnProperty"}},{"type":"browser_compatibility","value":{"title":"Browser-Kompatibilität","id":"browser-kompatibilität","isH3":false,"query":"javascript.builtins.Object.hasOwnProperty"}},{"type":"prose","value":{"id":"siehe_auch","title":"Siehe auch","isH3":false,"content":"<ul>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn\"><code>Object.hasOwn()</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">Aufzählbarkeit und Eigentümerschaft von Eigenschaften</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames\"><code>Object.getOwnPropertyNames()</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/for...in\"><code>for...in</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/in\"><code>in</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain\">Vererbung und die Prototypenkette</a></li>\n</ul>"}}],"toc":[{"text":"Probieren Sie es aus","id":"probieren_sie_es_aus"},{"text":"Syntax","id":"syntax"},{"text":"Beschreibung","id":"beschreibung"},{"text":"Beispiele","id":"beispiele"},{"text":"Spezifikationen","id":"spezifikationen"},{"text":"Browser-Kompatibilität","id":"browser-kompatibilität"},{"text":"Siehe auch","id":"siehe_auch"}],"summary":"Die hasOwnProperty() Methode von Object Instanzen gibt einen Boolean zurück, der anzeigt, ob dieses Objekt die angegebene Eigenschaft als eigene Eigenschaft hat (im Gegensatz dazu, sie zu erben).","popularity":0,"modified":"2022-08-14T03:39:57.000Z","other_translations":[{"locale":"en-US","title":"Object.prototype.hasOwnProperty()","native":"English (US)"},{"locale":"es","title":"Object.prototype.hasOwnProperty()","native":"Español"},{"locale":"fr","title":"Object.prototype.hasOwnProperty()","native":"Français"},{"locale":"ja","title":"Object.prototype.hasOwnProperty()","native":"日本語"},{"locale":"ko","title":"Object.prototype.hasOwnProperty()","native":"한국어"},{"locale":"pt-BR","title":"Object.prototype.hasOwnProperty()","native":"Português (do Brasil)"},{"locale":"ru","title":"Object.prototype.hasOwnProperty()","native":"Русский"},{"locale":"zh-CN","title":"Object.prototype.hasOwnProperty()","native":"中文 (简体)"},{"locale":"zh-TW","title":"Object.prototype.hasOwnProperty()","native":"正體中文 (繁體)"}],"pageType":"unknown","source":{"folder":"de/web/javascript/reference/global_objects/object/hasownproperty","github_url":"https://github.com/mdn/translated-content/blob/main/files/de/web/javascript/reference/global_objects/object/hasownproperty/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/aebcbfc2355fccddc193e6b25ba720935bf90172","filename":"index.md"},"short_title":"Object.prototype.hasOwnProperty()","parents":[{"uri":"/de/docs/Web","title":"Web-Technologien für Entwickler"},{"uri":"/de/docs/Web/JavaScript","title":"JavaScript"},{"uri":"/de/docs/Web/JavaScript/Reference","title":"JavaScript-Referenz"},{"uri":"/de/docs/Web/JavaScript/Reference/Global_Objects","title":"Standard eingebaute Objekte"},{"uri":"/de/docs/Web/JavaScript/Reference/Global_Objects/Object","title":"Object"},{"uri":"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty","title":"Object.prototype.hasOwnProperty()"}],"pageTitle":"Object.prototype.hasOwnProperty() - JavaScript | MDN","noIndexing":false}}</script></body></html>