Applies to: Function Object
The length porperty is use to get the number of arguments defined for a function.
Syntax
functionname.length
The functionname argument is required and is the name of the function in question.
Return
Returns the number of arguments defined for a function.
Example
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);
}
document.write(ArgTest(79, 81, 12, "Henry"));
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 To run the code above, paste it into JavaScript Editor, and click the Execute button
See also: arguments Property, length Property (Array), length Property (String) |
