Methods
Properties
The Function object is use to create a new function.
Syntax 1
function functionname( [argname1 [, ... argnameN]] )
{
body
}
Syntax 2
var functionname = new Function( [argname1, [... argnameN,]] body );
The Function object syntax has these parts:
Part |
Description |
functionname |
The name of the newly created function |
argname1...argnameN |
An optional list of arguments that the function accepts. |
body |
A string that contains the block of JavaScript code to be executed when the function is called. |
Example
The function is a basic data type in JavaScript. Syntax 1 creates a function value that JavaScript converts into a Function object when necessary. JavaScript converts Function objects created by Syntax 2 into function values at the time the function is called.
Syntax 1 is the standard way to create new functions in JavaScript. Syntax 2 is an alternative form used to create function objects explicitly.
For example, to create a function that adds the two arguments passed to it, you can do it in either of two ways:
Example 1
function add(x, y)
{
return(x + y);
}
|
Example 2
var add = new Function("x", "y", "return(x+y)");
|
In either case, you call the function with a line of code similar to the following:
|
| Note When calling a function, ensure that you always include the parentheses and any required arguments. Calling a function without parentheses causes the text of the function to be returned instead of the results of the function. |
|
See also: function Statement, new Operator, var Statement |
