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Object.prototype (Property)

The prototype for the Object object, which can be used to extend the interface for all Object objects.

Availability:

ECMAScript edition - 2
JavaScript - 1.1
JScript - 3.0
Internet Explorer - 4.0
Netscape - 3.0
Opera - 3.0
Property/method value type:Object object
JavaScript syntax:-Object.prototype
-myObject.constructor.prototype

The initial value of the prototype property of an Object object is the built in Object prototype object.

Object objects inherit the following properties from the Object.prototype:

Object objects inherit the following methods from their prototype:

The prototype property for the Object prototype object is null.

The example demonstrates how to provide extensions to all instances of this class by adding a function to the prototype object.

Warnings:

Example code:

   <HTML>

   <HEAD>

   </HEAD>

   <BODY>

   <SCRIPT>

   // Define a function that extends the output capabilities of Object objects

   function init()

   {

      this.width  = 100;

      this.height = 200;

      this.depth  = 300;

      return "";

   }

   // Register the new function

   Object.prototype.init = init;

   // Create a new object

   myObject = new Object();

   myObject.init();

   document.write(myObject.width  + "<BR>");

   document.write(myObject.height + "<BR>");

   document.write(myObject.depth  + "<BR>");

   </SCRIPT>

   </BODY>

   </HTML>

See also:Arguments object, Function.arguments[], JellyScript, Object object, Object(), Object.constructor, Object.toString(), Object.valueOf(), prototype property

Property attributes:

ReadOnly, DontDelete, DontEnum.

Cross-references:

ECMA 262 edition 2 - section - 15.2.3.1

ECMA 262 edition 2 - section - 15.2.4

ECMA 262 edition 3 - section - 15.2.3.1

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JavaScript Programmer's Reference, Cliff Wootton
Wrox Press (www.wrox.com)

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