Function Object
There are several ways to define a function in JavaScript:
Function Statement:
function functionname(arguments){ //standard function
statements...
}
function (arguments){ //unnamed function. JavaScript 1.2.
statements...
}
Constructor:
new Function(arguments, body)
Properties
|
Properties |
Description |
|
Arguments |
A local variable that points to the Arguments
object, which in turn contains all of the arguments passed into the
function. Use "arguments.length" to determine the number of
arguments entered. Note that this is different from the old
arguments[] array, which has been deprecated in JavaScript 1.2. Example(s) |
|
caller |
References the invoking function, if any. |
|
length |
Returns the number of named arguments specified. |
|
prototype |
Prototype property, to add custom properties and
methods to this object. |
Methods
|
Methods |
Description |
|
apply() |
n/a |
|
call() |
n/a |
|
toString() |
n/a |
Examples
Arguments(x)
This function below alerts the number of arguments passed into it:
function tellme(){
alert(arguments.length)
}
tellme(1,2,3) //alerts 3
tellme("George", "Tom") //alerts 2
