length Property (Function) (Windows Scripting - JScript)

 

Returns the number of arguments defined for a function.

Syntax

functionName.length

Remarks

The required functionName is the name of the function.

The length property of a function is initialized by the scripting engine to the number of arguments in the function's definition when an instance of the function is created.

What happens when a function is called with a number of arguments different from the value of its length property depends on the function.

The following example illustrates the use of the length property:

function ArgTest(a, b){
   var s = "";

   s += "Expected Arguments: " + ArgTest.length;
   s += "<br />";
   s += "Passed Arguments: " + arguments.length;

   document.write (s);
}

Requirements

Version 2

Applies To: Function Object (Windows Scripting - JScript)

Change History

Date	History	Reason
March 2009	Simplified the example.	Information enhancement.

See Also

arguments Property (Windows Scripting - JScript)
length Property (Array) (Windows Scripting - JScript)
length Property (String) (Windows Scripting - JScript)