length Property (Function)
Returns the number of arguments defined for a function.
function.length
Arguments
- function
Required. The name of the currently executing Function object.
Remarks
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.
Example
The following example illustrates the use of the length property:
function ArgTest(a, b)
{
var s = "Expected Arguments: " + ArgTest.length;
return (s);
}