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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="#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">Eingebaute Standardobjekte</a></li><li class="section"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a></li><li class="toggle"><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 class="toggle"><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 class="toggle"><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 empfohlen für neue Webseiten."> <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 empfohlen für neue Webseiten."> <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 empfohlen für neue Webseiten."> <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 empfohlen für neue Webseiten."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty"><code>Object.prototype.hasOwnProperty()</code></a></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 class="toggle"><details open=""><summary>Instanzeigenschaften</summary><ol><li><em><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto" aria-current="page"><code>Object.prototype.__proto__</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht empfohlen für neue Webseiten."> <span class="visually-hidden">Veraltet</span> </abbr></em></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor"><code>Object.prototype.constructor</code></a></li></ol></details></li><li class="section">Vererbung</li><li class="section"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object/Function</code></a></li><li class="toggle"><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/toString"><code>Function.prototype.toString()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance"><code>Function.prototype[Symbol.hasInstance]()</code></a></li></ol></details></li><li class="toggle"><details><summary>Statische Eigenschaften</summary><ol><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 vor der Verwendung die Browser-Kompatibilität."> <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><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 vor der Verwendung die Browser-Kompatibilität."> <span class="visually-hidden">Nicht standardisiert</span> </abbr><abbr class="icon icon-deprecated" title="Veraltet. Nicht empfohlen für neue Webseiten."> <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 vor der Verwendung die Browser-Kompatibilität."> <span class="visually-hidden">Nicht standardisiert</span> </abbr><abbr class="icon icon-deprecated" title="Veraltet. Nicht empfohlen für neue Webseiten."> <span class="visually-hidden">Veraltet</span> </abbr></li></ol></details></li><li class="toggle"><details><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 empfohlen für neue Webseiten."> <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 empfohlen für neue Webseiten."> <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 empfohlen für neue Webseiten."> <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 empfohlen für neue Webseiten."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty"><code>Object.prototype.hasOwnProperty()</code></a></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 class="toggle"><details><summary>Instanzeigenschaften</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto" aria-current="page"><code>Object.prototype.__proto__</code></a><abbr class="icon icon-deprecated" title="Veraltet. Nicht empfohlen für neue Webseiten."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor"><code>Object.prototype.constructor</code></a></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="#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.__proto__</h1></header><div class="section-content"><div class="notecard deprecated"><p><strong>Veraltet:</strong> Diese Funktion wird nicht mehr empfohlen. Obwohl einige Browser sie möglicherweise noch unterstützen, könnte sie bereits aus den relevanten Webstandards entfernt worden sein, in Kürze entfernt werden oder nur noch aus Kompatibilitätsgründen bestehen. Vermeiden Sie die Verwendung und aktualisieren Sie vorhandenen Code, falls möglich; siehe die <a href="#browser-kompatibilität">Kompatibilitätstabelle</a> am Ende dieser Seite, um Ihre Entscheidung zu unterstützen. Beachten Sie, dass diese Funktion jederzeit aufhören könnte zu funktionieren.</p></div> <div class="notecard warning"> <p><strong>Warnung:</strong> Das Ändern des <code>[[Prototype]]</code> eines Objekts ist aufgrund der Art und Weise, wie moderne JavaScript-Engines den Zugriff auf Eigenschaften optimieren, derzeit in jedem Browser und jeder JavaScript-Engine eine sehr langsame Operation. Außerdem sind die Auswirkungen der Änderung der Vererbung subtil und weitreichend und beschränken sich nicht nur auf die Zeit, die im <code>obj.__proto__ = ...</code>-Statement verbracht wird, sondern können sich auf <strong><em>jede</em></strong> Funktion erstrecken, die auf ein Objekt zugreift, dessen <code>[[Prototype]]</code> verändert wurde. Weitere Informationen finden Sie unter <a href="https://mathiasbynens.be/notes/prototypes" class="external" target="_blank">JavaScript engine fundamentals: optimizing prototypes</a>.</p> </div> <div class="notecard note"> <p><strong>Hinweis:</strong> Die Verwendung von <code>__proto__</code> ist umstritten und wird nicht empfohlen. Seine Existenz und das genaue Verhalten wurden nur als veraltetes Feature standardisiert, um die Web-Kompatibilität zu gewährleisten, während es mehrere Sicherheitsprobleme und Stolperfallen mit sich bringt. Für besseren Support sollten Sie stattdessen <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf"><code>Object.getPrototypeOf()</code></a>/<a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf"><code>Reflect.getPrototypeOf()</code></a> und <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf"><code>Object.setPrototypeOf()</code></a>/<a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf"><code>Reflect.setPrototypeOf()</code></a> verwenden.</p> </div> <p>Die <strong><code>__proto__</code></strong> Accessor-Eigenschaft von <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a>-Instanzen gibt das <a href="/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain"><code>[[Prototype]]</code></a> (entweder ein Objekt oder <a href="/de/docs/Web/JavaScript/Reference/Operators/null"><code>null</code></a>) dieses Objekts frei.</p> <p>Die <code>__proto__</code>-Eigenschaft kann auch in einer Objekt-Literal-Definition verwendet werden, um das Objekt-<code>[[Prototype]]</code> bei der Erstellung festzulegen, als Alternative zu <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/create"><code>Object.create()</code></a>. Siehe: <a href="/de/docs/Web/JavaScript/Reference/Operators/Object_initializer">Objekt-Initialisierer / Literal-Syntax</a>. Diese Syntax ist standardisiert und optimiert in Implementierungen und unterscheidet sich erheblich von <code>Object.prototype.__proto__</code>.</p></div><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>obj.__proto__ </code></pre></div></div></section><section aria-labelledby="rückgabewert"><h3 id="rückgabewert"><a href="#rückgabewert">Rückgabewert</a></h3><div class="section-content"><p>Wenn als Getter verwendet, gibt das <code>[[Prototype]]</code> des Objekts zurück.</p></div></section><section aria-labelledby="ausnahmen"><h3 id="ausnahmen"><a href="#ausnahmen">Ausnahmen</a></h3><div class="section-content"><dl> <dt id="typeerror"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError"><code>TypeError</code></a></dt> <dd> <p>Wird ausgelöst, wenn versucht wird, das Prototyp eines <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible">nicht erweiterbaren</a> Objekts oder eines <a href="https://tc39.es/ecma262/multipage/ordinary-and-exotic-objects-behaviours.html#sec-immutable-prototype-exotic-objects" class="external" target="_blank">unveränderlichen exotischen Prototyps</a> festzulegen, wie <code>Object.prototype</code> oder <a href="/de/docs/Web/API/Window"><code>window</code></a>.</p> </dd> </dl></div></section><section aria-labelledby="beschreibung"><h2 id="beschreibung"><a href="#beschreibung">Beschreibung</a></h2><div class="section-content"><p>Die <code>__proto__</code> Getter-Funktion gibt den Wert des internen <code>[[Prototype]]</code> eines Objekts frei. Für Objekte, die mit einem Objekt-Literal erstellt wurden (sofern Sie nicht die <a href="/de/docs/Web/JavaScript/Reference/Operators/Object_initializer#prototype_setter">Prototype-Setter</a>-Syntax verwenden), ist dieser Wert <code>Object.prototype</code>. Für Objekte, die mit Array-Literalen erstellt worden sind, ist dieser Wert <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array"><code>Array.prototype</code></a>. Für Funktionen ist dieser Wert <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype"><code>Function.prototype</code></a>. Weitere Informationen zur Prototyp-Kette finden Sie in <a href="/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain">Inheritance and the prototype chain</a>.</p> <p>Der <code>__proto__</code>-Setter erlaubt es, das <code>[[Prototype]]</code> eines Objekts zu ändern. Der gegebene Wert muss ein Objekt oder <a href="/de/docs/Web/JavaScript/Reference/Operators/null"><code>null</code></a> sein. Jeder andere Wert wird nichts bewirken.</p> <p>Im Gegensatz zu <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf"><code>Object.getPrototypeOf()</code></a> und <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf"><code>Object.setPrototypeOf()</code></a>, die immer als statische Eigenschaften auf <code>Object</code> verfügbar sind und immer die interne <code>[[Prototype]]</code>-Eigenschaft widerspiegeln, existiert die <code>__proto__</code>-Eigenschaft nicht immer als Eigenschaft auf allen Objekten und reflektiert daher <code>[[Prototype]]</code> nicht zuverlässig.</p> <p>Die <code>__proto__</code>-Eigenschaft ist nur eine Accessor-Eigenschaft auf <code>Object.prototype</code>, bestehend aus einer Getter- und Setter-Funktion. Ein Eigenschaftszugriff auf <code>__proto__</code>, der letztendlich <code>Object.prototype</code> abfragt, wird diese Eigenschaft finden, aber ein Zugriff, der <code>Object.prototype</code> nicht abfragt, wird es nicht tun. Wenn eine andere <code>__proto__</code>-Eigenschaft gefunden wird, bevor <code>Object.prototype</code> abgefragt wird, wird diese die auf <code>Object.prototype</code> gefundene Eigenschaft verbergen.</p> <p><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects"><code>null</code>-Prototyp-Objekte</a> erben keine Eigenschaft von <code>Object.prototype</code>, einschließlich der <code>__proto__</code> Accessor-Eigenschaft. Deshalb wird der Wert, wenn Sie <code>__proto__</code> auf solch einem Objekt lesen, immer <code>undefined</code> sein, unabhängig vom tatsächlichen <code>[[Prototype]]</code> des Objekts, und jede Zuordnung zu <code>__proto__</code> würde eine neue Eigenschaft namens <code>__proto__</code> erstellen, anstatt das Prototyp des Objekts festzulegen. Darüber hinaus kann <code>__proto__</code> als eigene Eigenschaft auf jeder Objektinstanz durch <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty"><code>Object.defineProperty()</code></a> neu definiert werden, ohne den Setter auszulösen. In diesem Fall wird <code>__proto__</code> nicht länger ein Accessor für <code>[[Prototype]]</code> sein. Daher sollten Sie immer <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf"><code>Object.getPrototypeOf()</code></a> und <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf"><code>Object.setPrototypeOf()</code></a> bevorzugen, um das <code>[[Prototype]]</code> eines Objekts festzulegen und abzurufen.</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___proto__"><h3 id="verwendung_von___proto__"><a href="#verwendung_von___proto__">Verwendung von __proto__</a></h3><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>function Circle() {} const shape = {}; const circle = new Circle(); // Set the object prototype. // DEPRECATED. This is for example purposes only. DO NOT DO THIS in real code. shape.__proto__ = circle; // Get the object prototype console.log(shape.__proto__ === Circle); // false </code></pre></div> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const ShapeA = function () {}; const ShapeB = { a() { console.log("aaa"); }, }; ShapeA.prototype.__proto__ = ShapeB; console.log(ShapeA.prototype.__proto__); // { a: [Function: a] } const shapeA = new ShapeA(); shapeA.a(); // aaa console.log(ShapeA.prototype === shapeA.__proto__); // true </code></pre></div> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const ShapeC = function () {}; const ShapeD = { a() { console.log("a"); }, }; const shapeC = new ShapeC(); shapeC.__proto__ = ShapeD; shapeC.a(); // a console.log(ShapeC.prototype === shapeC.__proto__); // false </code></pre></div> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>function Test() {} Test.prototype.myName = function () { console.log("myName"); }; const test = new Test(); console.log(test.__proto__ === Test.prototype); // true test.myName(); // myName const obj = {}; obj.__proto__ = Test.prototype; obj.myName(); // myName </code></pre></div></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.__proto__">ECMAScript® 2025 Language Specification <br/><small># sec-object.prototype.__proto__</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/isPrototypeOf"><code>Object.prototype.isPrototypeOf()</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/setPrototypeOf"><code>Object.setPrototypeOf()</code></a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 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15.47-18.01h-15.26v-5.647h24.352v5.646L88.616 56.385h15.704v5.646H79.523Zm29.318-23.657h11.183V62.03h-7.578V38.375h-3.632v-5.646zm3.605-9.672h7.578v5.646h-7.578zm13.17 0h11.21v38.976h-7.578v-33.33h-3.632zm16.801 0H153.6v38.976h-7.577v-33.33h-3.632v-5.646zm29.03 9.123c4.442 0 7.394 2.143 8.231 5.881h2.194v-5.332h9.276v5.646h-3.632v18.011h3.632v5.646h-4.442c-3.135 0-4.834-1.699-4.834-4.836V56.7h-2.194c-.81 3.738-3.789 5.881-8.23 5.881-6.978 0-11.916-5.829-11.916-15.214 0-9.384 4.938-15.187 11.915-15.187m2.3 24.363c4.284 0 6.192-2.196 6.192-7.032v-4.287c0-4.836-1.908-7.032-6.193-7.032-4.18 0-6.193 2.196-6.193 7.032v4.287c0 4.836 2.012 7.032 6.193 7.032m48.34 5.489h-7.577V0h7.577zm6.585-29.643h32.165v-2.196l-21.295-7.634v-6.143l21.295-7.633V6.588h-25.345V0h32.165v12.522l-17.35 5.881V20.6l17.35 5.882v12.521h-38.985zm0-25.801h6.794v6.796h-6.794z"></path></svg></a><ul class="footer-moz-list"><li class="footer-moz-item"><a href="https://www.mozilla.org/privacy/websites/" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Website Privacy Notice</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/privacy/websites/#cookies" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Cookies</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/about/legal/terms/mozilla" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Legal</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/about/governance/policies/participation/" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Community Participation Guidelines</a></li></ul></div><div class="page-footer-legal"><p id="license" class="page-footer-legal-text">Visit <a href="https://www.mozilla.org" target="_blank" rel="noopener noreferrer">Mozilla Corporation’s</a> not-for-profit parent, the <a target="_blank" rel="noopener noreferrer" href="https://foundation.mozilla.org/">Mozilla Foundation</a>.<br/>Portions of this content are ©1998–2025 by individual mozilla.org contributors. 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/proto","doc":{"body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<div class=\"notecard deprecated\"><p><strong>Veraltet:</strong> Diese Funktion wird nicht mehr empfohlen. Obwohl einige Browser sie möglicherweise noch unterstützen, könnte sie bereits aus den relevanten Webstandards entfernt worden sein, in Kürze entfernt werden oder nur noch aus Kompatibilitätsgründen bestehen. Vermeiden Sie die Verwendung und aktualisieren Sie vorhandenen Code, falls möglich; siehe die <a href=\"#browser-kompatibilität\">Kompatibilitätstabelle</a> am Ende dieser Seite, um Ihre Entscheidung zu unterstützen. Beachten Sie, dass diese Funktion jederzeit aufhören könnte zu funktionieren.</p></div>\n<div class=\"notecard warning\">\n<p><strong>Warnung:</strong>\nDas Ändern des <code>[[Prototype]]</code> eines Objekts ist aufgrund der Art und Weise, wie moderne JavaScript-Engines den Zugriff auf Eigenschaften optimieren, derzeit in jedem Browser und jeder JavaScript-Engine eine sehr langsame Operation. Außerdem sind die Auswirkungen der Änderung der Vererbung subtil und weitreichend und beschränken sich nicht nur auf die Zeit, die im <code>obj.__proto__ = ...</code>-Statement verbracht wird, sondern können sich auf <strong><em>jede</em></strong> Funktion erstrecken, die auf ein Objekt zugreift, dessen <code>[[Prototype]]</code> verändert wurde. Weitere Informationen finden Sie unter <a href=\"https://mathiasbynens.be/notes/prototypes\" class=\"external\" target=\"_blank\">JavaScript engine fundamentals: optimizing prototypes</a>.</p>\n</div>\n<div class=\"notecard note\">\n<p><strong>Hinweis:</strong>\nDie Verwendung von <code>__proto__</code> ist umstritten und wird nicht empfohlen. Seine Existenz und das genaue Verhalten wurden nur als veraltetes Feature standardisiert, um die Web-Kompatibilität zu gewährleisten, während es mehrere Sicherheitsprobleme und Stolperfallen mit sich bringt. Für besseren Support sollten Sie stattdessen <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf\"><code>Object.getPrototypeOf()</code></a>/<a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf\"><code>Reflect.getPrototypeOf()</code></a> und <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf\"><code>Object.setPrototypeOf()</code></a>/<a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf\"><code>Reflect.setPrototypeOf()</code></a> verwenden.</p>\n</div>\n<p>Die <strong><code>__proto__</code></strong> Accessor-Eigenschaft von <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a>-Instanzen gibt das <a href=\"/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain\"><code>[[Prototype]]</code></a> (entweder ein Objekt oder <a href=\"/de/docs/Web/JavaScript/Reference/Operators/null\"><code>null</code></a>) dieses Objekts frei.</p>\n<p>Die <code>__proto__</code>-Eigenschaft kann auch in einer Objekt-Literal-Definition verwendet werden, um das Objekt-<code>[[Prototype]]</code> bei der Erstellung festzulegen, als Alternative zu <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/create\"><code>Object.create()</code></a>. Siehe: <a href=\"/de/docs/Web/JavaScript/Reference/Operators/Object_initializer\">Objekt-Initialisierer / Literal-Syntax</a>. Diese Syntax ist standardisiert und optimiert in Implementierungen und unterscheidet sich erheblich von <code>Object.prototype.__proto__</code>.</p>"}},{"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>obj.__proto__\n</code></pre></div>"}},{"type":"prose","value":{"id":"rückgabewert","title":"Rückgabewert","isH3":true,"content":"<p>Wenn als Getter verwendet, gibt das <code>[[Prototype]]</code> des Objekts zurück.</p>"}},{"type":"prose","value":{"id":"ausnahmen","title":"Ausnahmen","isH3":true,"content":"<dl>\n<dt id=\"typeerror\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError\"><code>TypeError</code></a></dt>\n<dd>\n<p>Wird ausgelöst, wenn versucht wird, das Prototyp eines <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible\">nicht erweiterbaren</a> Objekts oder eines <a href=\"https://tc39.es/ecma262/multipage/ordinary-and-exotic-objects-behaviours.html#sec-immutable-prototype-exotic-objects\" class=\"external\" target=\"_blank\">unveränderlichen exotischen Prototyps</a> festzulegen, wie <code>Object.prototype</code> oder <a href=\"/de/docs/Web/API/Window\"><code>window</code></a>.</p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"beschreibung","title":"Beschreibung","isH3":false,"content":"<p>Die <code>__proto__</code> Getter-Funktion gibt den Wert des internen <code>[[Prototype]]</code> eines Objekts frei. Für Objekte, die mit einem Objekt-Literal erstellt wurden (sofern Sie nicht die <a href=\"/de/docs/Web/JavaScript/Reference/Operators/Object_initializer#prototype_setter\">Prototype-Setter</a>-Syntax verwenden), ist dieser Wert <code>Object.prototype</code>. Für Objekte, die mit Array-Literalen erstellt worden sind, ist dieser Wert <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array\"><code>Array.prototype</code></a>. Für Funktionen ist dieser Wert <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype\"><code>Function.prototype</code></a>. Weitere Informationen zur Prototyp-Kette finden Sie in <a href=\"/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain\">Inheritance and the prototype chain</a>.</p>\n<p>Der <code>__proto__</code>-Setter erlaubt es, das <code>[[Prototype]]</code> eines Objekts zu ändern. Der gegebene Wert muss ein Objekt oder <a href=\"/de/docs/Web/JavaScript/Reference/Operators/null\"><code>null</code></a> sein. Jeder andere Wert wird nichts bewirken.</p>\n<p>Im Gegensatz zu <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf\"><code>Object.getPrototypeOf()</code></a> und <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf\"><code>Object.setPrototypeOf()</code></a>, die immer als statische Eigenschaften auf <code>Object</code> verfügbar sind und immer die interne <code>[[Prototype]]</code>-Eigenschaft widerspiegeln, existiert die <code>__proto__</code>-Eigenschaft nicht immer als Eigenschaft auf allen Objekten und reflektiert daher <code>[[Prototype]]</code> nicht zuverlässig.</p>\n<p>Die <code>__proto__</code>-Eigenschaft ist nur eine Accessor-Eigenschaft auf <code>Object.prototype</code>, bestehend aus einer Getter- und Setter-Funktion. Ein Eigenschaftszugriff auf <code>__proto__</code>, der letztendlich <code>Object.prototype</code> abfragt, wird diese Eigenschaft finden, aber ein Zugriff, der <code>Object.prototype</code> nicht abfragt, wird es nicht tun. Wenn eine andere <code>__proto__</code>-Eigenschaft gefunden wird, bevor <code>Object.prototype</code> abgefragt wird, wird diese die auf <code>Object.prototype</code> gefundene Eigenschaft verbergen.</p>\n<p><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects\"><code>null</code>-Prototyp-Objekte</a> erben keine Eigenschaft von <code>Object.prototype</code>, einschließlich der <code>__proto__</code> Accessor-Eigenschaft. Deshalb wird der Wert, wenn Sie <code>__proto__</code> auf solch einem Objekt lesen, immer <code>undefined</code> sein, unabhängig vom tatsächlichen <code>[[Prototype]]</code> des Objekts, und jede Zuordnung zu <code>__proto__</code> würde eine neue Eigenschaft namens <code>__proto__</code> erstellen, anstatt das Prototyp des Objekts festzulegen. Darüber hinaus kann <code>__proto__</code> als eigene Eigenschaft auf jeder Objektinstanz durch <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty\"><code>Object.defineProperty()</code></a> neu definiert werden, ohne den Setter auszulösen. In diesem Fall wird <code>__proto__</code> nicht länger ein Accessor für <code>[[Prototype]]</code> sein. Daher sollten Sie immer <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf\"><code>Object.getPrototypeOf()</code></a> und <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf\"><code>Object.setPrototypeOf()</code></a> bevorzugen, um das <code>[[Prototype]]</code> eines Objekts festzulegen und abzurufen.</p>"}},{"type":"prose","value":{"id":"beispiele","title":"Beispiele","isH3":false,"content":""}},{"type":"prose","value":{"id":"verwendung_von___proto__","title":"Verwendung von __proto__","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>function Circle() {}\nconst shape = {};\nconst circle = new Circle();\n\n// Set the object prototype.\n// DEPRECATED. This is for example purposes only. DO NOT DO THIS in real code.\nshape.__proto__ = circle;\n\n// Get the object prototype\nconsole.log(shape.__proto__ === Circle); // false\n</code></pre></div>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const ShapeA = function () {};\nconst ShapeB = {\n a() {\n console.log(\"aaa\");\n },\n};\n\nShapeA.prototype.__proto__ = ShapeB;\nconsole.log(ShapeA.prototype.__proto__); // { a: [Function: a] }\n\nconst shapeA = new ShapeA();\nshapeA.a(); // aaa\nconsole.log(ShapeA.prototype === shapeA.__proto__); // true\n</code></pre></div>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const ShapeC = function () {};\nconst ShapeD = {\n a() {\n console.log(\"a\");\n },\n};\n\nconst shapeC = new ShapeC();\nshapeC.__proto__ = ShapeD;\nshapeC.a(); // a\nconsole.log(ShapeC.prototype === shapeC.__proto__); // false\n</code></pre></div>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>function Test() {}\nTest.prototype.myName = function () {\n console.log(\"myName\");\n};\n\nconst test = new Test();\nconsole.log(test.__proto__ === Test.prototype); // true\ntest.myName(); // myName\n\nconst obj = {};\nobj.__proto__ = Test.prototype;\nobj.myName(); // myName\n</code></pre></div>"}},{"type":"specifications","value":{"id":"spezifikationen","title":"Spezifikationen","isH3":false,"specifications":[{"bcdSpecificationURL":"https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-object.prototype.__proto__","title":"ECMAScript® 2025 Language Specification"}],"query":"javascript.builtins.Object.proto"}},{"type":"browser_compatibility","value":{"id":"browser-kompatibilität","title":"Browser-Kompatibilität","isH3":false,"query":"javascript.builtins.Object.proto"}},{"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/isPrototypeOf\"><code>Object.prototype.isPrototypeOf()</code></a></li>\n<li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf\"><code>Object.getPrototypeOf()</code></a></li>\n<li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf\"><code>Object.setPrototypeOf()</code></a></li>\n</ul>"}}],"isActive":true,"isMarkdown":true,"isTranslated":true,"locale":"de","mdn_url":"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto","modified":"2025-02-17T00:20:27.000Z","native":"Deutsch","noIndexing":false,"other_translations":[{"locale":"en-US","title":"Object.prototype.__proto__","native":"English (US)"},{"locale":"es","title":"Object.prototype.__proto__","native":"Español"},{"locale":"fr","title":"Object.prototype.__proto__","native":"Français"},{"locale":"ja","title":"Object.prototype.__proto__","native":"日本語"},{"locale":"ko","title":"Object.prototype.__proto__","native":"한국어"},{"locale":"pt-BR","title":"Object.prototype.__proto__","native":"Português (do Brasil)"},{"locale":"ru","title":"Object.prototype.__proto__","native":"Русский"},{"locale":"zh-CN","title":"Object.prototype.__proto__","native":"中文 (简体)"}],"pageTitle":"Object.prototype.__proto__ - JavaScript | MDN","parents":[{"uri":"/de/docs/Web","title":"Webtechnologie 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":"Eingebaute Standardobjekte"},{"uri":"/de/docs/Web/JavaScript/Reference/Global_Objects/Object","title":"Object"},{"uri":"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto","title":"Object.prototype.__proto__"}],"popularity":null,"short_title":"Object.prototype.__proto__","sidebarHTML":"<ol><li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects\">Eingebaute Standardobjekte</a></li><li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a></li><li class=\"toggle\"><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 class=\"toggle\"><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 class=\"toggle\"><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 empfohlen für neue Webseiten.\">\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 empfohlen für neue Webseiten.\">\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 empfohlen für neue Webseiten.\">\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 empfohlen für neue Webseiten.\">\n<span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty\"><code>Object.prototype.hasOwnProperty()</code></a></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 class=\"toggle\"><details open=\"\"><summary>Instanzeigenschaften</summary><ol><li><em><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto\" aria-current=\"page\"><code>Object.prototype.__proto__</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht empfohlen für neue Webseiten.\">\n<span class=\"visually-hidden\">Veraltet</span>\n</abbr></em></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor\"><code>Object.prototype.constructor</code></a></li></ol></details></li><li class=\"section\">Vererbung</li><li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object/Function</code></a></li><li class=\"toggle\"><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/toString\"><code>Function.prototype.toString()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance\"><code>Function.prototype[Symbol.hasInstance]()</code></a></li></ol></details></li><li class=\"toggle\"><details><summary>Statische Eigenschaften</summary><ol><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 vor der Verwendung die Browser-Kompatibilität.\">\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><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 vor der Verwendung die Browser-Kompatibilität.\">\n<span class=\"visually-hidden\">Nicht standardisiert</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht empfohlen für neue Webseiten.\">\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 vor der Verwendung die Browser-Kompatibilität.\">\n<span class=\"visually-hidden\">Nicht standardisiert</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht empfohlen für neue Webseiten.\">\n<span class=\"visually-hidden\">Veraltet</span>\n</abbr></li></ol></details></li><li class=\"toggle\"><details><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 empfohlen für neue Webseiten.\">\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 empfohlen für neue Webseiten.\">\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 empfohlen für neue Webseiten.\">\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 empfohlen für neue Webseiten.\">\n<span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty\"><code>Object.prototype.hasOwnProperty()</code></a></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 class=\"toggle\"><details><summary>Instanzeigenschaften</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/proto\" aria-current=\"page\"><code>Object.prototype.__proto__</code></a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht empfohlen für neue Webseiten.\">\n<span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor\"><code>Object.prototype.constructor</code></a></li></ol></details></li></ol>","source":{"folder":"de/web/javascript/reference/global_objects/object/proto","github_url":"https://github.com/mdn/translated-content-de/blob/main/files/de/web/javascript/reference/global_objects/object/proto/index.md","last_commit_url":"https://github.com/mdn/translated-content-de/commit/452fe502cfb4c9a91c346af17370ecfb6a8bd17e","filename":"index.md"},"summary":"Die __proto__ Accessor-Eigenschaft von Object-Instanzen gibt das [[Prototype]] (entweder ein Objekt oder null) dieses Objekts frei.","title":"Object.prototype.__proto__","toc":[{"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"}],"browserCompat":["javascript.builtins.Object.proto"],"pageType":"javascript-instance-accessor-property"}}</script></body></html>