What is the difference between Javascript and Adobe Javascript?

Noticed when bro开发者_如何学Gowsing for script files in Photoshop you can select standard Javascript (js) files and Adobe Javascript files (jsx). What's the difference?

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According to http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/Acro6JSGuide.pdf

Acrobat JavaScript is based on the core of JavaScript version 1.5 of ISO-16262, formerly known as ECMAScript. Acrobat JavaScript implements extensions, in the form of new objects and their accompanying methods and properties, to the JavaScript programming language. These Acrobat-specific objects enable a developer to manipulate a PDF file, allowing the PDF file to communicate with a database, modify its appearance, and so on. Because the Acrobat-specific objects are added on top of core JavaScript, you still have access to standard classes like Math, String, Date, Array, and RegExp.

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JavaScript is the trade name for the ECMA-262 standard. Vendors are free to make changes to it and support or not support specific features.

For specifics on Adobe JavaScript see: http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/photoshop/pdfs/photoshop_cs5_javascript_ref.pdf

While Mozilla (Netscape) created JavaScript they made it a standard for anyone to use. In the interest of not re-inventing the wheel vendors incorporate JavaScript into various software products. In Adobe's case this means specific functions for their product that is not needed for browser based implementations.