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Core JavaScript Reference 1.5

About this Book

JavaScript is Netscape's cross-platform, object-based scripting language. This book is a reference manual for the core JavaScript language.

This preface contains the following sections:

New Features in this Release

JavaScript version 1.5 provides the following new features and enhancements:

What You Should Already Know

This book assumes you have the following basic background: Some programming experience with a language such as C or Visual Basic is useful, but not required.

JavaScript Versions

Each version of Navigator supports a different version of JavaScript. To help you write scripts that are compatible with multiple versions of Navigator, this manual lists the JavaScript version in which each feature was implemented.

The following table lists the JavaScript version supported by different Navigator versions. Versions of Navigator prior to 2.0 do not support JavaScript.

Table 1    JavaScript and Navigator versions

JavaScript version

Navigator version

JavaScript 1.0  

Navigator 2.0  

JavaScript 1.1  

Navigator 3.0  

JavaScript 1.2  

Navigator 4.0-4.05  

JavaScript 1.3  

Navigator 4.06-4.7x  

JavaScript 1.4  


JavaScript 1.5  

Navigator 6.0

Mozilla (open source browser)  

Each version of the Netscape Enterprise Server also supports a different version of JavaScript. To help you write scripts that are compatible with multiple versions of the Enterprise Server, this manual uses an abbreviation to indicate the server version in which each feature was implemented.

Table 2    JavaScript and Netscape Enterprise Server versions


Enterpriser Server version

NES 2.0  

Netscape Enterprise Server 2.0  

NES 3.0  

Netscape Enterprise Server 3.0  

Where to Find JavaScript Information

The core JavaScript documentation includes the following books:
  • The Core JavaScript Guide provides information about the core JavaScript language and its objects.

  • The Core JavaScript Reference (this book) provides reference material for the core JavaScript language.

If you are new to JavaScript, start with the Core JavaScript Guide. Once you have a firm grasp of the fundamentals, you can use the Core JavaScript Reference to get more details on individual objects and statements.

Document Conventions

JavaScript applications run on many operating systems; the information in this book applies to all versions. File and directory paths are given in Windows format (with backslashes separating directory names). For Unix versions, the directory paths are the same, except that you use slashes instead of backslashes to separate directories.

This book uses uniform resource locators (URLs) of the following form:


In these URLs, server represents the name of the server on which you run your application, such as research1 or www; domain represents your Internet domain name, such as or; path represents the directory structure on the server; and file.htmll represents an individual file name. In general, items in italics in URLs are placeholders and items in normal monospace font are literals. If your server has Secure Sockets Layer (SSL) enabled, you would use https instead of http in the URL.

This book uses the following font conventions:

  • The monospace font is used for sample code and code listings, API and language elements (such as method names and property names), file names, path names, directory names, HTML tags, and any text that must be typed on the screen. (Monospace italic font is used for placeholders embedded in code.)

  • Italic type is used for book titles, emphasis, variables and placeholders, and words used in the literal sense.

  • Boldface type is used for glossary terms.

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Last Updated September 28, 2000