From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:42:52 -0500 Subject: initial commit --- .../referencje/obiekty/function/index.html | 237 +++++++++++++++++++++ 1 file changed, 237 insertions(+) create mode 100644 files/pl/web/javascript/referencje/obiekty/function/index.html (limited to 'files/pl/web/javascript/referencje/obiekty/function/index.html') diff --git a/files/pl/web/javascript/referencje/obiekty/function/index.html b/files/pl/web/javascript/referencje/obiekty/function/index.html new file mode 100644 index 0000000000..2db4d33411 --- /dev/null +++ b/files/pl/web/javascript/referencje/obiekty/function/index.html @@ -0,0 +1,237 @@ +--- +title: Function +slug: Web/JavaScript/Referencje/Obiekty/Function +tags: + - Function + - JavaScript + - Konstruktor +translation_of: Web/JavaScript/Reference/Global_Objects/Function +--- +
{{JSRef}}
+ +

Konstruktor Function tworzy nowy obiekt Function(tworzy funkcję poprzez konstruktor). W JavaScripcie właściwie każda funkcja jest obiektem Function.

+ +

Składnia

+ +
new Function ([arg1[, arg2[, ...argN]],] functionBody)
+ +

Parametry

+ +
+
arg1, arg2, ... argN
+
Names to be used by the function as formal argument names. Each must be a string that corresponds to a valid JavaScript identifier or a list of such strings separated with a comma; for example "x", "theValue", or "a,b".
+
functionBody
+
A string containing the JavaScript statements comprising the function definition.
+
+ +

Opis

+ +

Function objects created with the Function constructor are parsed when the function is created. This is less efficient than declaring a function with a function expression or function statement and calling it within your code, because such functions are parsed with the rest of the code.

+ +

All arguments passed to the function are treated as the names of the identifiers of the parameters in the function to be created, in the order in which they are passed.

+ +
+

Note: Functions created with the Function constructor do not create closures to their creation contexts; they always are created in the global scope. When running them, they will only be able to access their own local variables and global ones, not the ones from the scope in which the Function constructor was called. This is different from using {{jsxref("Global_Objects/eval", "eval")}} with code for a function expression.

+
+ +

Wywołanie konstruktora Function jako funkcję (bez użycia operatora 'new') ma taki sam efekt jak wywołanie konstruktora(z operatorem).

+ +

Właściwości i metody Function

+ +

The global Function object has no methods or properties of its own, however, since it is a function itself it does inherit some methods and properties through the prototype chain from {{jsxref("Function.prototype")}}.

+ +

Function prototype object

+ +

Właściwości

+ +
{{page('/en-US/docs/JavaScript/Reference/Global_Objects/Function/prototype', 'Properties')}}
+ +

Metody

+ +
{{page('/en-US/docs/JavaScript/Reference/Global_Objects/Function/prototype', 'Methods')}}
+ +

Function instances

+ +

Function instances inherit methods and properties from {{jsxref("Function.prototype")}}. As with all constructors, you can change the constructor's prototype object to make changes to all Function instances.

+ +

Przykłady

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Przykład: Specifying arguments with the Function constructor

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Poniższy przykład tworzy obiekt Function(tworzy funkcję poprzez konstruktor), który przyjmuje dwa argumenty.

+ +
// Przykład może być uruchomiony bezpośrednio w konsoli JavaScript
+
+// Tworzy funkcję, która przyjmuje dwa argumenty i zwraca ich sumę
+var adder = new Function('a', 'b', 'return a + b');
+
+// Wywołanie funkcji
+adder(2, 6);
+// > 8
+
+ +

Argumenty "a" i "b" są formanie nazwami argumentrów, które są użyte w ciele funkcji, "return a + b".

+ +

Przykład: A recursive shortcut to massively modify the DOM

+ +

Creating functions with the Function constructor is one of the ways to dynamically create an indeterminate number of new objects with some executable code into the global scope from a function. The following example (a recursive shortcut to massively modify the DOM) is impossible without the invocation of the Function constructor for each new query if you want to avoid closures.

+ +
<!doctype html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+<title>MDN Example - a recursive shortcut to massively modify the DOM</title>
+<script type="text/javascript">
+var domQuery = (function() {
+  var aDOMFunc = [
+    Element.prototype.removeAttribute,
+    Element.prototype.setAttribute,
+    CSSStyleDeclaration.prototype.removeProperty,
+    CSSStyleDeclaration.prototype.setProperty
+  ];
+
+  function setSomething(bStyle, sProp, sVal) {
+    var bSet = Boolean(sVal), fAction = aDOMFunc[bSet | bStyle << 1],
+        aArgs = Array.prototype.slice.call(arguments, 1, bSet ? 3 : 2),
+        aNodeList = bStyle ? this.cssNodes : this.nodes;
+
+    if (bSet && bStyle) { aArgs.push(''); }
+    for (
+      var nItem = 0, nLen = this.nodes.length;
+      nItem < nLen;
+      fAction.apply(aNodeList[nItem++], aArgs)
+    );
+    this.follow = setSomething.caller;
+    return this;
+  }
+
+  function setStyles(sProp, sVal) { return setSomething.call(this, true, sProp, sVal); }
+  function setAttribs(sProp, sVal) { return setSomething.call(this, false, sProp, sVal); }
+  function getSelectors() { return this.selectors; };
+  function getNodes() { return this.nodes; };
+
+  return (function(sSelectors) {
+    var oQuery = new Function('return arguments.callee.follow.apply(arguments.callee, arguments);');
+    oQuery.selectors = sSelectors;
+    oQuery.nodes = document.querySelectorAll(sSelectors);
+    oQuery.cssNodes = Array.prototype.map.call(oQuery.nodes, function(oInlineCSS) { return oInlineCSS.style; });
+    oQuery.attributes = setAttribs;
+    oQuery.inlineStyle = setStyles;
+    oQuery.follow = getNodes;
+    oQuery.toString = getSelectors;
+    oQuery.valueOf = getNodes;
+    return oQuery;
+  });
+})();
+</script>
+</head>
+
+<body>
+
+<div class="testClass">Lorem ipsum</div>
+<p>Some text</p>
+<div class="testClass">dolor sit amet</div>
+
+<script type="text/javascript">
+domQuery('.testClass')
+  .attributes('lang', 'en')('title', 'Risus abundat in ore stultorum')
+  .inlineStyle('background-color', 'black')('color', 'white')('width', '100px')('height', '50px');
+</script>
+</body>
+
+</html>
+ +

 

+ +

Specyfikacja

+ +

 

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SpecificationStatusComment
ECMAScript 1st Edition.StandardInitial definition. Implemented in JavaScript 1.0.
{{SpecName('ES5.1', '#sec-15.3', 'Function')}}{{Spec2('ES5.1')}} 
{{SpecName('ES6', '#sec-function-objects', 'Function')}}{{Spec2('ES6')}} 
+ +

Kompatybilność z przeglądarkami

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{{CompatibilityTable}}
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FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
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+ + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
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Zobacz również

+ + -- cgit v1.2.3-54-g00ecf