Dokumentacja języka JavaScript 1.5:Obiekty:Function

z Mozilla Developer Center, polskiego centrum programistów Mozilli.

This page documents the use of the Function object itself and its use as a constructor. For a list of properties and methods inherited by Function instances, see Function.prototype.

Spis treści 1 Podsumowanie 2 Składnia 3 Parametry 4 Opis 5 Własności 6 Metody 7 Przykłady 7.1 Przykład: Specifying arguments with the Function constructor 8 Zobacz także

[edytuj] Podsumowanie

Every function in JavaScript is actually a Function object.

[edytuj] Składnia

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

[edytuj] 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.

Invoking the Function constructor as a function (without using the new operator) has the same effect as invoking it as a constructor.

[edytuj] Opis

Function objects created with the Function constructor are evaluated each time they are used. This is less efficient than declaring a function and calling it within your code, because declared functions are parsed only once.

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.

[edytuj] Własności

prototype

Allows the extension of all Function objects.

[edytuj] Metody

Although the Function object does not provide any methods of its own, it does inherit methods through the prototype chain.

[edytuj] Przykłady

[edytuj] Przykład: Specifying arguments with the Function constructor

The following code creates a Function object that takes two arguments.

var multiply = new Function("x", "y", "return x * y");
var theAnswer = multiply(7, 6);

The arguments "x" and "y" are formal argument names that are used in the function body, "return x * y".

[edytuj] Zobacz także

• Operator function
• Polecenie function
• [[[Core JavaScript 1.5 Reference:Functions|Functions]]