Pure JavaScript

String.prototype

JavaScript 1.1+, ECMAScript 1.0+, JScript 3.0+ NES2+, Nav3+, IE 4+, Opera3+ Syntax

String.prototype.property

String.prototype.method
						

Description

The prototype property of the String object allows a programmer to add properties or methods to a core JavaScript object.

Example

Listing 6.246 creates two instances of the String object. Then it prototypes a new property, type, and a new method, verify(). In the script, the type property is assigned to the string instances and then they are checked using the verify() method. The results of the validation are then written to the user's page.

Listing 6.246 Using the prototype Property to Create New Properties and Methods of the String Object

<script language="JavaScript1.1"> ...