Netscape's resource site for JavaScript (originally developed by Netscape). Includes documentation for JavaScript versions 1.3 to 1.5.
»devedge.netscape.com/central/javas...
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mozilla.org's JavaScript information and resource site. Includes some very useful links to other JavaScript resources.
»www.mozilla.org/js/
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The name says it all, and it's true. Covers up to JavaScript version 1.5. Includes a comprehensive reference section with information about what features are available in which version.
JavaScript: The Definitive Guide