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Chapter 1. Introduction to JavaScript > Versions of JavaScript

1.2. Versions of JavaScript

JavaScript has evolved over the years, and Netscape has released several versions of the language. Microsoft has released similar versions of the JavaScript language under the name "JScript." And ECMA (http://www.ecma.ch) has published three versions of the ECMA-262 standard that standardize the JavaScript language under the awkward name "ECMAScript."

Table 1-1 lists these various versions and explains their key features and how they are related to one another. In this book, I often use the name "JavaScript" to refer to any implementation of the language, including Microsoft's JScript. When I'm specifically referring to ECMAScript, I often use the terms "ECMA-262" or "ECMA."


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