Returns the number of arguments defined for a function.
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.
Example
The following example illustrates the use of the length property:
Copy Code | |
---|---|
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); } |
Requirements
Applies To: Function Object (JScript 5.6)