JavaScript Tutorial for Programmers - Versions of JavaScript
July 12, 1998
There are several versions of JavaScript supported by certain
browsers and browser versions. Unfortunately,
this can often lead to confusion and incompatibilities.
Since Netscape originally introduced JavaScript,
JavaScript 1.0 was the language specification supported in
Netscape Navigator 2.0. Subsequently, Navigator 3.0 supported
new enhancements which comprised JavaScript 1.1.
At present, Navigator 4.0 supports JavaScript 1.2.
In parallel, Microsoft attempted to support JavaScript 1.0 in
their Internet Explorer 3.0 browser. Known as
"Jscript,"
Microsoft's initial JavaScript support was unreliable and buggy.
A push to standardize the language resulted in an
"official" version of JavaScript sanctioned by the
ECMA. Internet Explorer 4.0 includes robust support for the
ECMA standardized JavaScript, which, although it shares much
in common with Netscape's JavaScript 1.2, is not exactly
equivalent.
While programming for any single version of JavaScript is
relatively simple, writing code which functions across
disparate versions, most notably Navigator 4 and MSIE 4,
is one of the major challenges and topics of discussion
in JavaScript programming at this time.
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