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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="#beschreibung">Beschreibung</a></li><li class="document-toc-item "><a class="document-toc-link" href="#statische_eigenschaften">Statische Eigenschaften</a></li><li class="document-toc-item "><a class="document-toc-link" href="#statische_methoden">Statische Methoden</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"><em><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect" aria-current="page"><code>Reflect</code></a></em></li><li><details open=""><summary>Statische Methoden</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply"><code>Reflect.apply()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct"><code>Reflect.construct()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty"><code>Reflect.defineProperty()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/deleteProperty"><code>Reflect.deleteProperty()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get"><code>Reflect.get()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor"><code>Reflect.getOwnPropertyDescriptor()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf"><code>Reflect.getPrototypeOf()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/has"><code>Reflect.has()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible"><code>Reflect.isExtensible()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys"><code>Reflect.ownKeys()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions"><code>Reflect.preventExtensions()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set"><code>Reflect.set()</code></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf"><code>Reflect.setPrototypeOf()</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="#beschreibung">Beschreibung</a></li><li class="document-toc-item "><a class="document-toc-link" href="#statische_eigenschaften">Statische Eigenschaften</a></li><li class="document-toc-item "><a class="document-toc-link" href="#statische_methoden">Statische Methoden</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>Reflect</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 September 2016.</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%2FReflect&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>Das <strong><code>Reflect</code></strong> Namespace-Objekt enthält statische Methoden zum Aufrufen von abfangbaren internen JavaScript-Objektmethoden. Die Methoden sind dieselben wie die der <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy">Proxy-Handler</a>.</p></div><section aria-labelledby="beschreibung"><h2 id="beschreibung"><a href="#beschreibung">Beschreibung</a></h2><div class="section-content"><p>Im Gegensatz zu den meisten globalen Objekten ist <code>Reflect</code> kein Konstruktor. Sie können es weder mit dem <a href="/de/docs/Web/JavaScript/Reference/Operators/new"><code>new</code>-Operator</a> verwenden noch das <code>Reflect</code>-Objekt als Funktion aufrufen. Alle Eigenschaften und Methoden von <code>Reflect</code> sind statisch (genau wie das <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Math"><code>Math</code></a>-Objekt).</p> <p>Das <code>Reflect</code>-Objekt bietet eine Sammlung statischer Funktionen, die dieselben Namen wie die <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy">Proxy-Handler-Methoden</a> haben.</p> <p>Der Hauptanwendungsfall von <code>Reflect</code> besteht darin, ein Standardweiterleitungsverhalten in <code>Proxy</code>-Handler-Fallen bereitzustellen. Eine <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy#terminology">Falle</a> wird verwendet, um eine Operation an einem Objekt abzufangen — sie bietet eine benutzerdefinierte Implementierung für eine <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy#object_internal_methods">interne Objektmethode</a>. Die <code>Reflect</code>-API wird verwendet, um die entsprechende interne Methode auszuführen. Zum Beispiel erstellt der folgende Code einen Proxy <code>p</code> mit einer <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/deleteProperty"><code>deleteProperty</code></a>-Falle, die die interne Methode <code>[[Delete]]</code> abfängt. <code>Reflect.deleteProperty()</code> wird verwendet, um das Standardverhalten <code>[[Delete]]</code> direkt am <code>targetObject</code> auszuführen. Sie können es mit <a href="/de/docs/Web/JavaScript/Reference/Operators/delete"><code>delete</code></a> ersetzen, aber die Verwendung von <code>Reflect</code> erspart Ihnen, sich die Syntax zu merken, die jeder internen Methode entspricht.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const p = new Proxy( {}, { deleteProperty(targetObject, property) { // Custom functionality: log the deletion console.log("Deleting property:", property); // Execute the default introspection behavior return Reflect.deleteProperty(targetObject, property); }, }, ); </code></pre></div> <p>Die <code>Reflect</code>-Methoden ermöglichen auch eine feinere Kontrolle darüber, wie die interne Methode aufgerufen wird. Beispielsweise ist <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct"><code>Reflect.construct()</code></a> der einzige Weg, um eine Ziel-Funktion mit einem bestimmten <a href="/de/docs/Web/JavaScript/Reference/Operators/new.target"><code>new.target</code></a>-Wert zu konstruieren. Wenn Sie den <a href="/de/docs/Web/JavaScript/Reference/Operators/new"><code>new</code></a>-Operator verwenden, um eine Funktion aufzurufen, ist der <code>new.target</code>-Wert immer die Funktion selbst. Dies hat wichtige Auswirkungen beim <a href="/de/docs/Web/JavaScript/Reference/Operators/new.target#new.target_using_reflect.construct">Subklassieren</a>. Ein weiteres Beispiel ist <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get"><code>Reflect.get()</code></a>, welches es Ihnen ermöglicht, einen <a href="/de/docs/Web/JavaScript/Reference/Functions/get">Getter</a> mit einem benutzerdefinierten <code>this</code>-Wert auszuführen, während <a href="/de/docs/Web/JavaScript/Reference/Operators/Property_accessors">Eigenschafts-Accessor</a> immer das aktuelle Objekt als <code>this</code>-Wert verwenden.</p> <p>Das Verhalten fast jeder <code>Reflect</code>-Methode kann mit einer anderen Syntax oder Methode erreicht werden. Einige dieser Methoden haben entsprechende statische Methoden gleichen Namens in <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a>, obwohl sie einige subtile Unterschiede aufweisen. Für die genauen Unterschiede siehe die Beschreibung für jede <code>Reflect</code>-Methode.</p></div></section><section aria-labelledby="statische_eigenschaften"><h2 id="statische_eigenschaften"><a href="#statische_eigenschaften">Statische Eigenschaften</a></h2><div class="section-content"><dl> <dt id="reflectsymbol.tostringtag"><a href="#reflectsymbol.tostringtag"><code>Reflect[Symbol.toStringTag]</code></a></dt> <dd> <p>Der Anfangswert der <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag"><code>[Symbol.toStringTag]</code></a>-Eigenschaft ist der String <code>"Reflect"</code>. Diese Eigenschaft wird in <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString"><code>Object.prototype.toString()</code></a> verwendet.</p> </dd> </dl></div></section><section aria-labelledby="statische_methoden"><h2 id="statische_methoden"><a href="#statische_methoden">Statische Methoden</a></h2><div class="section-content"><dl> <dt id="reflect.apply"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply"><code>Reflect.apply()</code></a></dt> <dd> <p>Ruft eine <code>target</code>-Funktion mit den durch den Parameter <code>argumentsList</code> angegebenen Argumenten auf. Siehe auch <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/apply"><code>Function.prototype.apply()</code></a>.</p> </dd> <dt id="reflect.construct"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct"><code>Reflect.construct()</code></a></dt> <dd> <p>Der <a href="/de/docs/Web/JavaScript/Reference/Operators/new"><code>new</code>-Operator</a> als Funktion. Entspricht dem Aufruf von <code>new target(...argumentsList)</code>. Bietet zudem die Möglichkeit, ein anderes Prototyp zu spezifizieren.</p> </dd> <dt id="reflect.defineproperty"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty"><code>Reflect.defineProperty()</code></a></dt> <dd> <p>Ähnlich wie <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty"><code>Object.defineProperty()</code></a>. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn die Eigenschaft erfolgreich definiert wurde.</p> </dd> <dt id="reflect.deleteproperty"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/deleteProperty"><code>Reflect.deleteProperty()</code></a></dt> <dd> <p>Der <a href="/de/docs/Web/JavaScript/Reference/Operators/delete"><code>delete</code>-Operator</a> als Funktion. Entspricht dem Aufruf von <code>delete target[propertyKey]</code>.</p> </dd> <dt id="reflect.get"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get"><code>Reflect.get()</code></a></dt> <dd> <p>Gibt den Wert der Eigenschaft zurück. Funktioniert wie das Abrufen einer Eigenschaft aus einem Objekt (<code>target[propertyKey]</code>) als Funktion.</p> </dd> <dt id="reflect.getownpropertydescriptor"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor"><code>Reflect.getOwnPropertyDescriptor()</code></a></dt> <dd> <p>Ähnlich wie <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor"><code>Object.getOwnPropertyDescriptor()</code></a>. Gibt einen Eigenschafts-Deskriptor der angegebenen Eigenschaft zurück, wenn sie auf dem Objekt existiert, anderenfalls <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/undefined"><code>undefined</code></a>.</p> </dd> <dt id="reflect.getprototypeof"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf"><code>Reflect.getPrototypeOf()</code></a></dt> <dd> <p>Entspricht <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf"><code>Object.getPrototypeOf()</code></a>.</p> </dd> <dt id="reflect.has"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/has"><code>Reflect.has()</code></a></dt> <dd> <p>Gibt einen booleschen Wert zurück, der angibt, ob das target die Eigenschaft entweder als eigene oder geerbte Eigenschaft hat. Funktioniert wie der <a href="/de/docs/Web/JavaScript/Reference/Operators/in"><code>in</code>-Operator</a> als Funktion.</p> </dd> <dt id="reflect.isextensible"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible"><code>Reflect.isExtensible()</code></a></dt> <dd> <p>Entspricht <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible"><code>Object.isExtensible()</code></a>. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Ziel erweiterbar ist.</p> </dd> <dt id="reflect.ownkeys"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys"><code>Reflect.ownKeys()</code></a></dt> <dd> <p>Gibt ein Array der eigenen (nicht geerbten) Eigenschaftsschlüssel des Zielobjekts zurück.</p> </dd> <dt id="reflect.preventextensions"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions"><code>Reflect.preventExtensions()</code></a></dt> <dd> <p>Ähnlich wie <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions"><code>Object.preventExtensions()</code></a>. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Update erfolgreich war.</p> </dd> <dt id="reflect.set"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set"><code>Reflect.set()</code></a></dt> <dd> <p>Eine Funktion, die Werte für Eigenschaften zuweist. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Update erfolgreich war.</p> </dd> <dt id="reflect.setprototypeof"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf"><code>Reflect.setPrototypeOf()</code></a></dt> <dd> <p>Eine Funktion, die das Prototyp eines Objekts setzt. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Update erfolgreich war.</p> </dd> </dl></div></section><section aria-labelledby="beispiele"><h2 id="beispiele"><a href="#beispiele">Beispiele</a></h2><div class="section-content"></div></section><section aria-labelledby="erkennen_ob_ein_objekt_bestimmte_eigenschaften_enthält"><h3 id="erkennen_ob_ein_objekt_bestimmte_eigenschaften_enthält"><a href="#erkennen_ob_ein_objekt_bestimmte_eigenschaften_enthält">Erkennen, ob ein Objekt bestimmte Eigenschaften enthält</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>const duck = { name: "Maurice", color: "white", greeting() { console.log(`Quaaaack! My name is ${this.name}`); }, }; Reflect.has(duck, "color"); // true Reflect.has(duck, "haircut"); // false </code></pre></div></div></section><section aria-labelledby="rückgabe_der_eigenen_schlüssel_des_objekts"><h3 id="rückgabe_der_eigenen_schlüssel_des_objekts"><a href="#rückgabe_der_eigenen_schlüssel_des_objekts">Rückgabe der eigenen Schlüssel des Objekts</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>Reflect.ownKeys(duck); // [ "name", "color", "greeting" ] </code></pre></div></div></section><section aria-labelledby="hinzufügen_einer_neuen_eigenschaft_zum_objekt"><h3 id="hinzufügen_einer_neuen_eigenschaft_zum_objekt"><a href="#hinzufügen_einer_neuen_eigenschaft_zum_objekt">Hinzufügen einer neuen Eigenschaft zum Objekt</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>Reflect.set(duck, "eyes", "black"); // returns "true" if successful // "duck" now contains the property "eyes: 'black'" </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/reflection.html#sec-reflect-object">ECMAScript Language Specification <br/><small># sec-reflect-object</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/Proxy"><code>Proxy</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 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 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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/Reflect","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"Reflect","mdn_url":"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect","locale":"de","native":"Deutsch","browserCompat":["javascript.builtins.Reflect"],"baseline":{"baseline":"high","baseline_high_date":"2019-03-20","baseline_low_date":"2016-09-20","support":{"chrome":"49","chrome_android":"49","edge":"12","firefox":"18","firefox_android":"18","safari":"10","safari_ios":"10"}},"sidebarHTML":"<ol><li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects\">Globale Objekte</a></li><li class=\"section\"><em><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect\" aria-current=\"page\"><code>Reflect</code></a></em></li><li><details open=\"\"><summary>Statische Methoden</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply\"><code>Reflect.apply()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct\"><code>Reflect.construct()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty\"><code>Reflect.defineProperty()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/deleteProperty\"><code>Reflect.deleteProperty()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get\"><code>Reflect.get()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor\"><code>Reflect.getOwnPropertyDescriptor()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf\"><code>Reflect.getPrototypeOf()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/has\"><code>Reflect.has()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible\"><code>Reflect.isExtensible()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys\"><code>Reflect.ownKeys()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions\"><code>Reflect.preventExtensions()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set\"><code>Reflect.set()</code></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf\"><code>Reflect.setPrototypeOf()</code></a></li></ol></details></li></ol>","sidebarMacro":"JSRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>Das <strong><code>Reflect</code></strong> Namespace-Objekt enthält statische Methoden zum Aufrufen von abfangbaren internen JavaScript-Objektmethoden. Die Methoden sind dieselben wie die der <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy\">Proxy-Handler</a>.</p>"}},{"type":"prose","value":{"id":"beschreibung","title":"Beschreibung","isH3":false,"content":"<p>Im Gegensatz zu den meisten globalen Objekten ist <code>Reflect</code> kein Konstruktor. Sie können es weder mit dem <a href=\"/de/docs/Web/JavaScript/Reference/Operators/new\"><code>new</code>-Operator</a> verwenden noch das <code>Reflect</code>-Objekt als Funktion aufrufen. Alle Eigenschaften und Methoden von <code>Reflect</code> sind statisch (genau wie das <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Math\"><code>Math</code></a>-Objekt).</p>\n<p>Das <code>Reflect</code>-Objekt bietet eine Sammlung statischer Funktionen, die dieselben Namen wie die <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy\">Proxy-Handler-Methoden</a> haben.</p>\n<p>Der Hauptanwendungsfall von <code>Reflect</code> besteht darin, ein Standardweiterleitungsverhalten in <code>Proxy</code>-Handler-Fallen bereitzustellen. Eine <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy#terminology\">Falle</a> wird verwendet, um eine Operation an einem Objekt abzufangen — sie bietet eine benutzerdefinierte Implementierung für eine <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy#object_internal_methods\">interne Objektmethode</a>. Die <code>Reflect</code>-API wird verwendet, um die entsprechende interne Methode auszuführen. Zum Beispiel erstellt der folgende Code einen Proxy <code>p</code> mit einer <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/deleteProperty\"><code>deleteProperty</code></a>-Falle, die die interne Methode <code>[[Delete]]</code> abfängt. <code>Reflect.deleteProperty()</code> wird verwendet, um das Standardverhalten <code>[[Delete]]</code> direkt am <code>targetObject</code> auszuführen. Sie können es mit <a href=\"/de/docs/Web/JavaScript/Reference/Operators/delete\"><code>delete</code></a> ersetzen, aber die Verwendung von <code>Reflect</code> erspart Ihnen, sich die Syntax zu merken, die jeder internen Methode entspricht.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const p = new Proxy(\n {},\n {\n deleteProperty(targetObject, property) {\n // Custom functionality: log the deletion\n console.log(\"Deleting property:\", property);\n\n // Execute the default introspection behavior\n return Reflect.deleteProperty(targetObject, property);\n },\n },\n);\n</code></pre></div>\n<p>Die <code>Reflect</code>-Methoden ermöglichen auch eine feinere Kontrolle darüber, wie die interne Methode aufgerufen wird. Beispielsweise ist <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct\"><code>Reflect.construct()</code></a> der einzige Weg, um eine Ziel-Funktion mit einem bestimmten <a href=\"/de/docs/Web/JavaScript/Reference/Operators/new.target\"><code>new.target</code></a>-Wert zu konstruieren. Wenn Sie den <a href=\"/de/docs/Web/JavaScript/Reference/Operators/new\"><code>new</code></a>-Operator verwenden, um eine Funktion aufzurufen, ist der <code>new.target</code>-Wert immer die Funktion selbst. Dies hat wichtige Auswirkungen beim <a href=\"/de/docs/Web/JavaScript/Reference/Operators/new.target#new.target_using_reflect.construct\">Subklassieren</a>. Ein weiteres Beispiel ist <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get\"><code>Reflect.get()</code></a>, welches es Ihnen ermöglicht, einen <a href=\"/de/docs/Web/JavaScript/Reference/Functions/get\">Getter</a> mit einem benutzerdefinierten <code>this</code>-Wert auszuführen, während <a href=\"/de/docs/Web/JavaScript/Reference/Operators/Property_accessors\">Eigenschafts-Accessor</a> immer das aktuelle Objekt als <code>this</code>-Wert verwenden.</p>\n<p>Das Verhalten fast jeder <code>Reflect</code>-Methode kann mit einer anderen Syntax oder Methode erreicht werden. Einige dieser Methoden haben entsprechende statische Methoden gleichen Namens in <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a>, obwohl sie einige subtile Unterschiede aufweisen. Für die genauen Unterschiede siehe die Beschreibung für jede <code>Reflect</code>-Methode.</p>"}},{"type":"prose","value":{"id":"statische_eigenschaften","title":"Statische Eigenschaften","isH3":false,"content":"<dl>\n <dt id=\"reflectsymbol.tostringtag\"><a href=\"#reflectsymbol.tostringtag\"><code>Reflect[Symbol.toStringTag]</code></a></dt>\n <dd>\n <p>Der Anfangswert der <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag\"><code>[Symbol.toStringTag]</code></a>-Eigenschaft ist der String <code>\"Reflect\"</code>. Diese Eigenschaft wird in <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString\"><code>Object.prototype.toString()</code></a> verwendet.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"statische_methoden","title":"Statische Methoden","isH3":false,"content":"<dl>\n <dt id=\"reflect.apply\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply\"><code>Reflect.apply()</code></a></dt>\n <dd>\n <p>Ruft eine <code>target</code>-Funktion mit den durch den Parameter <code>argumentsList</code> angegebenen Argumenten auf. Siehe auch <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/apply\"><code>Function.prototype.apply()</code></a>.</p>\n </dd>\n <dt id=\"reflect.construct\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct\"><code>Reflect.construct()</code></a></dt>\n <dd>\n <p>Der <a href=\"/de/docs/Web/JavaScript/Reference/Operators/new\"><code>new</code>-Operator</a> als Funktion. Entspricht dem Aufruf von <code>new target(...argumentsList)</code>. Bietet zudem die Möglichkeit, ein anderes Prototyp zu spezifizieren.</p>\n </dd>\n <dt id=\"reflect.defineproperty\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty\"><code>Reflect.defineProperty()</code></a></dt>\n <dd>\n <p>Ähnlich wie <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty\"><code>Object.defineProperty()</code></a>. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn die Eigenschaft erfolgreich definiert wurde.</p>\n </dd>\n <dt id=\"reflect.deleteproperty\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/deleteProperty\"><code>Reflect.deleteProperty()</code></a></dt>\n <dd>\n <p>Der <a href=\"/de/docs/Web/JavaScript/Reference/Operators/delete\"><code>delete</code>-Operator</a> als Funktion. Entspricht dem Aufruf von <code>delete target[propertyKey]</code>.</p>\n </dd>\n <dt id=\"reflect.get\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get\"><code>Reflect.get()</code></a></dt>\n <dd>\n <p>Gibt den Wert der Eigenschaft zurück. Funktioniert wie das Abrufen einer Eigenschaft aus einem Objekt (<code>target[propertyKey]</code>) als Funktion.</p>\n </dd>\n <dt id=\"reflect.getownpropertydescriptor\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor\"><code>Reflect.getOwnPropertyDescriptor()</code></a></dt>\n <dd>\n <p>Ähnlich wie <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor\"><code>Object.getOwnPropertyDescriptor()</code></a>. Gibt einen Eigenschafts-Deskriptor der angegebenen Eigenschaft zurück, wenn sie auf dem Objekt existiert, anderenfalls <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/undefined\"><code>undefined</code></a>.</p>\n </dd>\n <dt id=\"reflect.getprototypeof\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf\"><code>Reflect.getPrototypeOf()</code></a></dt>\n <dd>\n <p>Entspricht <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf\"><code>Object.getPrototypeOf()</code></a>.</p>\n </dd>\n <dt id=\"reflect.has\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/has\"><code>Reflect.has()</code></a></dt>\n <dd>\n <p>Gibt einen booleschen Wert zurück, der angibt, ob das target die Eigenschaft entweder als eigene oder geerbte Eigenschaft hat. Funktioniert wie der <a href=\"/de/docs/Web/JavaScript/Reference/Operators/in\"><code>in</code>-Operator</a> als Funktion.</p>\n </dd>\n <dt id=\"reflect.isextensible\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible\"><code>Reflect.isExtensible()</code></a></dt>\n <dd>\n <p>Entspricht <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible\"><code>Object.isExtensible()</code></a>. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Ziel erweiterbar ist.</p>\n </dd>\n <dt id=\"reflect.ownkeys\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys\"><code>Reflect.ownKeys()</code></a></dt>\n <dd>\n <p>Gibt ein Array der eigenen (nicht geerbten) Eigenschaftsschlüssel des Zielobjekts zurück.</p>\n </dd>\n <dt id=\"reflect.preventextensions\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions\"><code>Reflect.preventExtensions()</code></a></dt>\n <dd>\n <p>Ähnlich wie <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions\"><code>Object.preventExtensions()</code></a>. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Update erfolgreich war.</p>\n </dd>\n <dt id=\"reflect.set\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set\"><code>Reflect.set()</code></a></dt>\n <dd>\n <p>Eine Funktion, die Werte für Eigenschaften zuweist. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Update erfolgreich war.</p>\n </dd>\n <dt id=\"reflect.setprototypeof\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf\"><code>Reflect.setPrototypeOf()</code></a></dt>\n <dd>\n <p>Eine Funktion, die das Prototyp eines Objekts setzt. Gibt einen booleschen Wert zurück, der <code>true</code> ist, wenn das Update erfolgreich war.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"beispiele","title":"Beispiele","isH3":false,"content":""}},{"type":"prose","value":{"id":"erkennen_ob_ein_objekt_bestimmte_eigenschaften_enthält","title":"Erkennen, ob ein Objekt bestimmte Eigenschaften enthält","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const duck = {\n name: \"Maurice\",\n color: \"white\",\n greeting() {\n console.log(`Quaaaack! My name is ${this.name}`);\n },\n};\n\nReflect.has(duck, \"color\");\n// true\nReflect.has(duck, \"haircut\");\n// false\n</code></pre></div>"}},{"type":"prose","value":{"id":"rückgabe_der_eigenen_schlüssel_des_objekts","title":"Rückgabe der eigenen Schlüssel des Objekts","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>Reflect.ownKeys(duck);\n// [ \"name\", \"color\", \"greeting\" ]\n</code></pre></div>"}},{"type":"prose","value":{"id":"hinzufügen_einer_neuen_eigenschaft_zum_objekt","title":"Hinzufügen einer neuen Eigenschaft zum Objekt","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>Reflect.set(duck, \"eyes\", \"black\");\n// returns \"true\" if successful\n// \"duck\" now contains the property \"eyes: 'black'\"\n</code></pre></div>"}},{"type":"specifications","value":{"title":"Spezifikationen","id":"spezifikationen","isH3":false,"specifications":[{"bcdSpecificationURL":"https://tc39.es/ecma262/multipage/reflection.html#sec-reflect-object","title":"ECMAScript Language Specification"}],"query":"javascript.builtins.Reflect"}},{"type":"browser_compatibility","value":{"title":"Browser-Kompatibilität","id":"browser-kompatibilität","isH3":false,"query":"javascript.builtins.Reflect"}},{"type":"prose","value":{"id":"siehe_auch","title":"Siehe auch","isH3":false,"content":"<ul>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy\"><code>Proxy</code></a></li>\n</ul>"}}],"toc":[{"text":"Beschreibung","id":"beschreibung"},{"text":"Statische Eigenschaften","id":"statische_eigenschaften"},{"text":"Statische Methoden","id":"statische_methoden"},{"text":"Beispiele","id":"beispiele"},{"text":"Spezifikationen","id":"spezifikationen"},{"text":"Browser-Kompatibilität","id":"browser-kompatibilität"},{"text":"Siehe auch","id":"siehe_auch"}],"summary":"Das Reflect Namespace-Objekt enthält statische Methoden zum Aufrufen von abfangbaren internen JavaScript-Objektmethoden. Die Methoden sind dieselben wie die der Proxy-Handler.","popularity":0,"modified":"2022-08-14T03:39:57.000Z","other_translations":[{"locale":"en-US","title":"Reflect","native":"English (US)"},{"locale":"es","title":"Reflect","native":"Español"},{"locale":"fr","title":"Reflect","native":"Français"},{"locale":"ja","title":"Reflect","native":"日本語"},{"locale":"ko","title":"Reflect","native":"한국어"},{"locale":"pt-BR","title":"Reflect","native":"Português (do Brasil)"},{"locale":"ru","title":"Reflect","native":"Русский"},{"locale":"zh-CN","title":"Reflect","native":"中文 (简体)"}],"pageType":"unknown","source":{"folder":"de/web/javascript/reference/global_objects/reflect","github_url":"https://github.com/mdn/translated-content/blob/main/files/de/web/javascript/reference/global_objects/reflect/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/aebcbfc2355fccddc193e6b25ba720935bf90172","filename":"index.md"},"short_title":"Reflect","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/Reflect","title":"Reflect"}],"pageTitle":"Reflect - JavaScript | MDN","noIndexing":false}}</script></body></html>