ECMAScript Language Specification
This section provides a quick description of the ECMAScript Language Specification and its version history.
ECMAScript edition history:
1997 ECMA-262 Edition 1 - First edition 1998 ECMA-262 Edition 2 - Editorial changes only 1999 ECMA-262 Edition 3 - Added many new features ? ECMA-262 Edition 4 - Abandoned 2009 ECMA-262 Edition 5 - Adds "strict mode" 2011 ECMA-262 Edition 5.1 - Aligned ISO/IEC 16262:2011
ECMA current definition of ECMAScript: ECMAScript is an object-oriented programming language for performing computations and manipulating computational objects within a host environment.
One very important note on the ECMAScript specification is that it does not provide any facilities to interact with the host environment. In another word, a pure ECMAScript code written only with rules and objects described with the specification can only perform computations and manipulate objects in memory. It will not able to exchange data with the host environment.
In order to exchange data with the host environment, each dialect of ECMAScript must extend the specification to add new facilities to interact with the host environment.
Another example, The JScript dialect of ECMAScript designed for the Internet Information Server (IIS) Web server host environment adds the "request" object and its properties and methods, providing access to the server's current HTTP request.
If you want to get a copy of the ECMA-262 (ECMAScript Language Specification) Edition 3, visit the http://www.herongyang.com/download/?Ecma-262.pdf page.
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