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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="#konstruktor">Konstruktor</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instanz-eigenschaften">Instanz-Eigenschaften</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instanz-methoden">Instanz-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/Function" aria-current="page"><code>Function</code></a></em></li><li><details open=""><summary>Konstruktor</summary><ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Function"><code>Function() Konstruktor</code></a></li></ol></details></li><li><details open=""><summary>Instanzmethoden</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 open=""><summary>Instanzeigenschaften</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 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><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><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><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="#konstruktor">Konstruktor</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instanz-eigenschaften">Instanz-Eigenschaften</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instanz-methoden">Instanz-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>Function</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%2FFunction&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>Function</code></strong> Objekt bietet Methoden für <a href="/de/docs/Web/JavaScript/Reference/Functions">Funktionen</a>. In JavaScript ist jede Funktion eigentlich ein <code>Function</code> Objekt.</p></div><section aria-labelledby="konstruktor"><h2 id="konstruktor"><a href="#konstruktor">Konstruktor</a></h2><div class="section-content"><dl> <dt id="function"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Function"><code>Function()</code></a></dt> <dd> <p>Erstellt ein neues <code>Function</code> Objekt. Der direkte Aufruf des Konstruktors kann Funktionen dynamisch erstellen, leidet jedoch unter Sicherheitsproblemen und ähnlichen (aber weit weniger signifikanten) Leistungsproblemen wie <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/eval"><code>eval()</code></a>. Im Gegensatz zu <code>eval()</code> erstellt der <code>Function</code> Konstruktor jedoch Funktionen, die nur im globalen Gültigkeitsbereich ausgeführt werden.</p> </dd> </dl></div></section><section aria-labelledby="instanz-eigenschaften"><h2 id="instanz-eigenschaften"><a href="#instanz-eigenschaften">Instanz-Eigenschaften</a></h2><div class="section-content"><p>Diese Eigenschaften sind auf <code>Function.prototype</code> definiert und werden von allen <code>Function</code> Instanzen geteilt.</p> <dl> <dt id="function.prototype.arguments"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/arguments"><code>Function.prototype.arguments</code></a> <abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr> <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></dt> <dd> <p>Repräsentiert die an diese Funktion übergebenen Argumente. Für <a href="/de/docs/Web/JavaScript/Reference/Strict_mode">strikte</a>, Pfeil-, asynchrone und Generatorfunktionen löst der Zugriff auf die <code>arguments</code> Eigenschaft einen <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError"><code>TypeError</code></a> aus. Verwenden Sie stattdessen das <a href="/de/docs/Web/JavaScript/Reference/Functions/arguments"><code>arguments</code></a> Objekt innerhalb von Funktionsbindungen.</p> </dd> <dt id="function.prototype.caller"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/caller"><code>Function.prototype.caller</code></a> <abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr> <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></dt> <dd> <p>Repräsentiert die Funktion, die diese Funktion aufgerufen hat. Für <a href="/de/docs/Web/JavaScript/Reference/Strict_mode">strikte</a>, Pfeil-, asynchrone und Generatorfunktionen löst der Zugriff auf die <code>caller</code> Eigenschaft einen <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError"><code>TypeError</code></a> aus.</p> </dd> <dt id="function.prototype.constructor"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor"><code>Function.prototype.constructor</code></a></dt> <dd> <p>Die Konstruktionsfunktion, die das Instanzobjekt erstellt hat. Für <code>Function</code> Instanzen ist der anfängliche Wert der <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Function"><code>Function</code></a> Konstruktor.</p> </dd> </dl> <p>Diese Eigenschaften sind eigene Eigenschaften jeder <code>Function</code> Instanz.</p> <dl> <dt id="displayname"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/displayName"><code>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> <span class="badge inline optional">Optional</span></dt> <dd> <p>Der Anzeigename der Funktion.</p> </dd> <dt id="length"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/length"><code>length</code></a></dt> <dd> <p>Gibt die Anzahl der Argumente an, die die Funktion erwartet.</p> </dd> <dt id="name"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/name"><code>name</code></a></dt> <dd> <p>Der Name der Funktion.</p> </dd> <dt id="prototype"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype"><code>prototype</code></a></dt> <dd> <p>Wird verwendet, wenn die Funktion als Konstruktor mit dem <a href="/de/docs/Web/JavaScript/Reference/Operators/new"><code>new</code></a> Operator verwendet wird. Es wird das neue Prototypobjekt.</p> </dd> </dl></div></section><section aria-labelledby="instanz-methoden"><h2 id="instanz-methoden"><a href="#instanz-methoden">Instanz-Methoden</a></h2><div class="section-content"><dl> <dt id="function.prototype.apply"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/apply"><code>Function.prototype.apply()</code></a></dt> <dd> <p>Ruft eine Funktion mit einem angegebenen <code>this</code> Wert und optionalen Argumenten auf, die als Array (oder ein <a href="/de/docs/Web/JavaScript/Guide/Indexed_collections#working_with_array-like_objects">array-ähnliches Objekt</a>) bereitgestellt werden.</p> </dd> <dt id="function.prototype.bind"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/bind"><code>Function.prototype.bind()</code></a></dt> <dd> <p>Erstellt eine neue Funktion, die, wenn sie aufgerufen wird, das <code>this</code> Schlüsselwort auf einen bereitgestellten Wert setzt, optional mit einer gegebenen Sequenz von Argumenten, die jedem bereitgestellten bei Aufruf der neuen Funktion vorangehen.</p> </dd> <dt id="function.prototype.call"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/call"><code>Function.prototype.call()</code></a></dt> <dd> <p>Ruft eine Funktion mit einem angegebenen <code>this</code> Wert und optionalen Argumenten auf.</p> </dd> <dt id="function.prototype.tostring"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/toString"><code>Function.prototype.toString()</code></a></dt> <dd> <p> Gibt eine Zeichenkette zurück, die den Quellcode der Funktion darstellt. Überschreibt die <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString"><code>Object.prototype.toString</code></a> Methode. </p> </dd> <dt id="function.prototypesymbol.hasinstance"><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance"><code>Function.prototype[Symbol.hasInstance]()</code></a></dt> <dd> <p>Gibt das Standardverfahren an, um festzustellen, ob eine Konstruktionsfunktion ein Objekt als eine der Instanzen des Konstruktors erkennt. Wird vom <a href="/de/docs/Web/JavaScript/Reference/Operators/instanceof"><code>instanceof</code></a> Operator aufgerufen.</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="unterschied_zwischen_function-konstruktor_und_funktionsdeklaration"><h3 id="unterschied_zwischen_function-konstruktor_und_funktionsdeklaration"><a href="#unterschied_zwischen_function-konstruktor_und_funktionsdeklaration">Unterschied zwischen Function-Konstruktor und Funktionsdeklaration</a></h3><div class="section-content"><p>Funktionen, die mit dem <code>Function</code> Konstruktor erstellt werden, erstellen keine Closures zu ihren Erzeugungskontexten; sie werden immer im globalen Gültigkeitsbereich erstellt. Beim Ausführen können sie nur auf ihre eigenen lokalen und globalen Variablen zugreifen, nicht auf die aus dem Bereich, in dem der <code>Function</code> Konstruktor erstellt wurde. Dies unterscheidet sich von der Verwendung von <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/eval"><code>eval()</code></a> mit Code für einen Funktionsausdruck.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>// Create a global property with `var` var x = 10; function createFunction1() { const x = 20; return new Function("return x;"); // this `x` refers to global `x` } function createFunction2() { const x = 20; function f() { return x; // this `x` refers to the local `x` above } return f; } const f1 = createFunction1(); console.log(f1()); // 10 const f2 = createFunction2(); console.log(f2()); // 20 </code></pre></div> <p>Während dieser Code in Webbrowsern funktioniert, wird <code>f1()</code> in Node.js einen <code>ReferenceError</code> erzeugen, da <code>x</code> nicht gefunden wird. Dies liegt daran, dass der oberste Gültigkeitsbereich in Node nicht der globale Gültigkeitsbereich ist und <code>x</code> lokal zum Modul sein wird.</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-function-objects">ECMAScript Language Specification <br/><small># sec-function-objects</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/Statements/function"><code>function</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Operators/function"><code>function</code> Ausdruck</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncFunction"><code>AsyncFunction</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncGeneratorFunction"><code>AsyncGeneratorFunction</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/GeneratorFunction"><code>GeneratorFunction</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Functions">Functions</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" 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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/Function","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"Function","mdn_url":"/de/docs/Web/JavaScript/Reference/Global_Objects/Function","locale":"de","native":"Deutsch","browserCompat":["javascript.builtins.Function"],"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\"><em><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function\" aria-current=\"page\"><code>Function</code></a></em></li><li><details open=\"\"><summary>Konstruktor</summary><ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Function\"><code>Function() Konstruktor</code></a></li></ol></details></li><li><details open=\"\"><summary>Instanzmethoden</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 open=\"\"><summary>Instanzeigenschaften</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 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><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><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><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>Das <strong><code>Function</code></strong> Objekt bietet Methoden für <a href=\"/de/docs/Web/JavaScript/Reference/Functions\">Funktionen</a>. In JavaScript ist jede Funktion eigentlich ein <code>Function</code> Objekt.</p>"}},{"type":"prose","value":{"id":"konstruktor","title":"Konstruktor","isH3":false,"content":"<dl>\n <dt id=\"function\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Function\"><code>Function()</code></a></dt>\n <dd>\n <p>Erstellt ein neues <code>Function</code> Objekt. Der direkte Aufruf des Konstruktors kann Funktionen dynamisch erstellen, leidet jedoch unter Sicherheitsproblemen und ähnlichen (aber weit weniger signifikanten) Leistungsproblemen wie <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/eval\"><code>eval()</code></a>. Im Gegensatz zu <code>eval()</code> erstellt der <code>Function</code> Konstruktor jedoch Funktionen, die nur im globalen Gültigkeitsbereich ausgeführt werden.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"instanz-eigenschaften","title":"Instanz-Eigenschaften","isH3":false,"content":"<p>Diese Eigenschaften sind auf <code>Function.prototype</code> definiert und werden von allen <code>Function</code> Instanzen geteilt.</p>\n<dl>\n <dt id=\"function.prototype.arguments\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/arguments\"><code>Function.prototype.arguments</code></a> <abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr> <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></dt>\n <dd>\n <p>Repräsentiert die an diese Funktion übergebenen Argumente. Für <a href=\"/de/docs/Web/JavaScript/Reference/Strict_mode\">strikte</a>, Pfeil-, asynchrone und Generatorfunktionen löst der Zugriff auf die <code>arguments</code> Eigenschaft einen <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError\"><code>TypeError</code></a> aus. Verwenden Sie stattdessen das <a href=\"/de/docs/Web/JavaScript/Reference/Functions/arguments\"><code>arguments</code></a> Objekt innerhalb von Funktionsbindungen.</p>\n </dd>\n <dt id=\"function.prototype.caller\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/caller\"><code>Function.prototype.caller</code></a> <abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr> <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></dt>\n <dd>\n <p>Repräsentiert die Funktion, die diese Funktion aufgerufen hat. Für <a href=\"/de/docs/Web/JavaScript/Reference/Strict_mode\">strikte</a>, Pfeil-, asynchrone und Generatorfunktionen löst der Zugriff auf die <code>caller</code> Eigenschaft einen <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError\"><code>TypeError</code></a> aus.</p>\n </dd>\n <dt id=\"function.prototype.constructor\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor\"><code>Function.prototype.constructor</code></a></dt>\n <dd>\n <p>Die Konstruktionsfunktion, die das Instanzobjekt erstellt hat. Für <code>Function</code> Instanzen ist der anfängliche Wert der <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Function\"><code>Function</code></a> Konstruktor.</p>\n </dd>\n</dl>\n<p>Diese Eigenschaften sind eigene Eigenschaften jeder <code>Function</code> Instanz.</p>\n<dl>\n <dt id=\"displayname\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/displayName\"><code>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> <span class=\"badge inline optional\">Optional</span></dt>\n <dd>\n <p>Der Anzeigename der Funktion.</p>\n </dd>\n <dt id=\"length\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/length\"><code>length</code></a></dt>\n <dd>\n <p>Gibt die Anzahl der Argumente an, die die Funktion erwartet.</p>\n </dd>\n <dt id=\"name\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/name\"><code>name</code></a></dt>\n <dd>\n <p>Der Name der Funktion.</p>\n </dd>\n <dt id=\"prototype\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype\"><code>prototype</code></a></dt>\n <dd>\n <p>Wird verwendet, wenn die Funktion als Konstruktor mit dem <a href=\"/de/docs/Web/JavaScript/Reference/Operators/new\"><code>new</code></a> Operator verwendet wird. Es wird das neue Prototypobjekt.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"instanz-methoden","title":"Instanz-Methoden","isH3":false,"content":"<dl>\n <dt id=\"function.prototype.apply\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/apply\"><code>Function.prototype.apply()</code></a></dt>\n <dd>\n <p>Ruft eine Funktion mit einem angegebenen <code>this</code> Wert und optionalen Argumenten auf, die als Array (oder ein <a href=\"/de/docs/Web/JavaScript/Guide/Indexed_collections#working_with_array-like_objects\">array-ähnliches Objekt</a>) bereitgestellt werden.</p>\n </dd>\n <dt id=\"function.prototype.bind\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/bind\"><code>Function.prototype.bind()</code></a></dt>\n <dd>\n <p>Erstellt eine neue Funktion, die, wenn sie aufgerufen wird, das <code>this</code> Schlüsselwort auf einen bereitgestellten Wert setzt, optional mit einer gegebenen Sequenz von Argumenten, die jedem bereitgestellten bei Aufruf der neuen Funktion vorangehen.</p>\n </dd>\n <dt id=\"function.prototype.call\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/call\"><code>Function.prototype.call()</code></a></dt>\n <dd>\n <p>Ruft eine Funktion mit einem angegebenen <code>this</code> Wert und optionalen Argumenten auf.</p>\n </dd>\n <dt id=\"function.prototype.tostring\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/toString\"><code>Function.prototype.toString()</code></a></dt>\n <dd>\n <p>\n Gibt eine Zeichenkette zurück, die den Quellcode der Funktion darstellt.\n Überschreibt die <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/toString\"><code>Object.prototype.toString</code></a> Methode.\n </p>\n </dd>\n <dt id=\"function.prototypesymbol.hasinstance\"><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance\"><code>Function.prototype[Symbol.hasInstance]()</code></a></dt>\n <dd>\n <p>Gibt das Standardverfahren an, um festzustellen, ob eine Konstruktionsfunktion ein Objekt als eine der Instanzen des Konstruktors erkennt. Wird vom <a href=\"/de/docs/Web/JavaScript/Reference/Operators/instanceof\"><code>instanceof</code></a> Operator aufgerufen.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"beispiele","title":"Beispiele","isH3":false,"content":""}},{"type":"prose","value":{"id":"unterschied_zwischen_function-konstruktor_und_funktionsdeklaration","title":"Unterschied zwischen Function-Konstruktor und Funktionsdeklaration","isH3":true,"content":"<p>Funktionen, die mit dem <code>Function</code> Konstruktor erstellt werden, erstellen keine Closures zu ihren Erzeugungskontexten; sie werden immer im globalen Gültigkeitsbereich erstellt. Beim Ausführen können sie nur auf ihre eigenen lokalen und globalen Variablen zugreifen, nicht auf die aus dem Bereich, in dem der <code>Function</code> Konstruktor erstellt wurde. Dies unterscheidet sich von der Verwendung von <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/eval\"><code>eval()</code></a> mit Code für einen Funktionsausdruck.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>// Create a global property with `var`\nvar x = 10;\n\nfunction createFunction1() {\n const x = 20;\n return new Function(\"return x;\"); // this `x` refers to global `x`\n}\n\nfunction createFunction2() {\n const x = 20;\n function f() {\n return x; // this `x` refers to the local `x` above\n }\n return f;\n}\n\nconst f1 = createFunction1();\nconsole.log(f1()); // 10\nconst f2 = createFunction2();\nconsole.log(f2()); // 20\n</code></pre></div>\n<p>Während dieser Code in Webbrowsern funktioniert, wird <code>f1()</code> in Node.js einen <code>ReferenceError</code> erzeugen, da <code>x</code> nicht gefunden wird. Dies liegt daran, dass der oberste Gültigkeitsbereich in Node nicht der globale Gültigkeitsbereich ist und <code>x</code> lokal zum Modul sein wird.</p>"}},{"type":"specifications","value":{"title":"Spezifikationen","id":"spezifikationen","isH3":false,"specifications":[{"bcdSpecificationURL":"https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-function-objects","title":"ECMAScript Language Specification"}],"query":"javascript.builtins.Function"}},{"type":"browser_compatibility","value":{"title":"Browser-Kompatibilität","id":"browser-kompatibilität","isH3":false,"query":"javascript.builtins.Function"}},{"type":"prose","value":{"id":"siehe_auch","title":"Siehe auch","isH3":false,"content":"<ul>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/function\"><code>function</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/function\"><code>function</code> Ausdruck</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncFunction\"><code>AsyncFunction</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncGeneratorFunction\"><code>AsyncGeneratorFunction</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/GeneratorFunction\"><code>GeneratorFunction</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Functions\">Functions</a></li>\n</ul>"}}],"toc":[{"text":"Konstruktor","id":"konstruktor"},{"text":"Instanz-Eigenschaften","id":"instanz-eigenschaften"},{"text":"Instanz-Methoden","id":"instanz-methoden"},{"text":"Beispiele","id":"beispiele"},{"text":"Spezifikationen","id":"spezifikationen"},{"text":"Browser-Kompatibilität","id":"browser-kompatibilität"},{"text":"Siehe auch","id":"siehe_auch"}],"summary":"Das Function Objekt bietet Methoden für Funktionen. In JavaScript ist jede Funktion eigentlich ein Function Objekt.","popularity":0,"modified":"2022-08-14T03:39:57.000Z","other_translations":[{"locale":"en-US","title":"Function","native":"English (US)"},{"locale":"es","title":"Function","native":"Español"},{"locale":"fr","title":"Function","native":"Français"},{"locale":"ja","title":"Function","native":"日本語"},{"locale":"ko","title":"Function","native":"한국어"},{"locale":"pt-BR","title":"Function","native":"Português (do Brasil)"},{"locale":"ru","title":"Function","native":"Русский"},{"locale":"zh-CN","title":"Function","native":"中文 (简体)"}],"pageType":"unknown","source":{"folder":"de/web/javascript/reference/global_objects/function","github_url":"https://github.com/mdn/translated-content/blob/main/files/de/web/javascript/reference/global_objects/function/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/aebcbfc2355fccddc193e6b25ba720935bf90172","filename":"index.md"},"short_title":"Function","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/Function","title":"Function"}],"pageTitle":"Function - JavaScript | MDN","noIndexing":false}}</script></body></html>