Client-Side Java Script Reference.pdf

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Client-Side JavaScript

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Netscape Communications Corporation ("Netscape") and its licensors retain all ownership rights to the software programs

offered by Netscape (referred to herein as "Software") and related documentation. Use of the Software and related

documentation is governed by the license agreement accompanying the Software and applicable copyright law.

Your right to copy this documentation is limited by copyright law. Making unauthorized copies, adaptations, or compilation

works is prohibited and constitutes a punishable violation of the law. Netscape may revise this documentation from time to

time without notice.

THIS DOCUMENTATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN NO EVENT SHALL NETSCAPE BE

LIABLE FOR INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY KIND ARISING FROM ANY

ERROR IN THIS DOCUMENTATION, INCLUDING WITHOUT LIMITATION ANY LOSS OR INTERRUPTION OF BUSINESS,

PROFITS, USE, OR DATA.

Netscape, Netscape Navigator, Netscape Certificate Server, Netscape DevEdge, Netscape FastTrack Server, Netscape ONE,

SuiteSpot and the Netscape N and Ship’s Wheel logos are registered trademarks of Netscape Communications Corporation in

the United States and other countries. Other Netscape logos, product names, and service names are also trademarks of

Netscape Communications Corporation, which may be registered in other countries. JavaScript is a trademark of Sun

Microsystems, Inc. used under license for technology invented and implemented by Netscape Communications Corporation.

Other product and brand names are trademarks of their respective owners.

The downloading, exporting, or reexporting of Netscape software or any underlying information or technology must be in

full compliance with all United States and other applicable laws and regulations. Any provision of Netscape software or

documentation to the U.S. Government is with restricted rights as described in the license agreement accompanying Netscape

software.

Recycled and Recyclable Paper

Version 1.3

Printed in the United States of America. 00 99 98 5 4 3 2 1

Netscape Communications Corporation, 501 East Middlefield Road, Mountain View, CA 94043

New Features in this Release

JavaScript version 1.3 provides the following new features and enhancements:

• ECMA compliance. JavaScript 1.3 is fully compatible with ECMA-262. See

the Client-Side JavaScript Guide for details.

• Unicode support. The Unicode character set can be used for all known

encoding, and you can use the Unicode escape sequence in string literals.

See escape and unescape . See the Client-Side JavaScript Guide for

details.

• Changes to the Array object.

• When you specify a single numeric parameter with the Array

constructor, you specify the initial length of the array.

•The push method returns the new length of the array rather than the last

element added to the array.

•The splice method always returns an array containing the removed

elements, even if only one element is removed.

•The toString method joins an array and returns a string containing

each array element separated by commas, rather than returning a string

representing the source code of the array.

•The length property contains an unsigned, 32-bit integer with a value

less than 2 32 .

• Changes to the Date object.

• Removed platform dependencies to provide a uniform behavior across

platforms.

• Changed the range for dates to -100,000,000 days to 100,000,000 days

relative to 01 January, 1970 UTC.

• Added a milliseconds parameter to the Date constructor.

• Added the getFullYear , setFullYear , getMilliseconds , and

setMilliseconds methods.

• Added the getUTCDate , getUTCDay , getUTCFullYear ,

getUTCHours , getUTCMilliseconds , getUTCMinutes ,

getUTCMonth , getUTCSeconds , setUTCDate , setUTCFullYear ,

setUTCHours , setUTCMilliseconds , setUTCMinutes ,

setUTCMonth , setUTCSeconds , and toUTCString methods.

• Added a day parameter to the setMonth method.

• Added minutes, seconds, and milliseconds parameters to the setHours

method.

• Added seconds and milliseconds parameters to the setMinutes

method.

• Added a milliseconds parameter to the setSeconds method.

• Added a milliseconds parameter to the UTC method.

• Deprecated the getYear , setYear , and toGMTString methods.

• Changes to the Function object.

• Added the apply method, which allows you to apply a method of

another object in the context of a different object (the calling object).

• Added the call method, which allows you to call (execute) a method

of another object in the context of a different object (the calling object).

• Deprecated the arguments.caller property.

4 Client-Side JavaScript Reference

• Changes to the String object.

• The charCodeAt and fromCharCode methods use Unicode values

rather than ISO-Latin-1 values.

• The replace method supports the nesting of a function in place of the

second argument.

• New method toSource. The toSource method returns a string

representing the source code of the object. See Array.toSource ,

Boolean.toSource , Date.toSource , Function.toSource ,

Number.toSource , Object.toSource , RegExp.toSource , and

String.toSource .

• New top-level properties Infinity, NaN, and undefined. Infinity is a

numeric value representing infinity. NaN is a value representing Not-A-

Number. undefined is the value undefined.

• New top-level function isFinite. isFinite evaluates an argument to

determine whether it is a finite number.

• Changes to the top-level eval function. You should not indirectly use the

eval function by invoking it via a name other than eval .

• New strict equality operators === and !==. The === (strict equal)

operator returns true if the operands are equal and of the same type. The

!== (strict not equal) operator returns true if the operands are not equal

and/or not of the same type. See “Comparison Operators” on page 635 and

“Using the Equality Operators” on page 637.

• Changes to the equality operators == and !=. The use of the == (equal)

and != (not equal) operators reverts to the JavaScript 1.1 implementation. If

the two operands are not of the same type, JavaScript attempts to convert

the operands to an appropriate type for the comparison. See “Using the

Equality Operators” on page 637.

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