Returns the number of arguments defined for a function.
functionName.length
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 i, s = "The ArgTest function expected ";
var numargs = ArgTest.arguments.length;
var expargs = ArgTest.length
;
if (expargs < 2)
s += expargs + " argument. ";
else
s += expargs + " arguments. ";
if (numargs < 2)
s += numargs + " was passed.";
else
s += numargs + " were passed.";
return(s);
}
arguments Property | length Property (Array) | length Property (String)
Applies To: Function Object