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Asked: 2026-05-15T16:38:36+00:00

I have the following script from http://javascript.about.com/library/bljver.htm <script type=text/javascript> var jsver = 1.0; </script>

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I have the following script from http://javascript.about.com/library/bljver.htm

<script type="text/javascript">
var jsver = 1.0;
</script>
<script language="Javascript1.1">
jsver = 1.1;
</script>
<script language="Javascript1.2">
jsver = 1.2;
</script>
<script language="Javascript1.3">
jsver = 1.3;
</script>
<script language="Javascript1.4">
jsver = 1.4;
</script>
<script language="Javascript1.5">
jsver = 1.5;
</script>
<script language="Javascript1.6">
jsver = 1.6;
</script>
<script type="text/javascript">
document.write('<p><b>Javascript version ' + jsver + ' supported<\/b><\/p>');
</script>

but wonder if there is a shorter way?

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1 Answer

  1. Editorial Team

    Looking at the comment you made to @meder, I would highly recommend you to go for feature detection, for example, to detect if the indexOf method is available on Array objects:

    if (typeof Array.prototype.indexOf == 'function') {
  //...
}

    The JavaScript (TM) version numbers refer to the Mozilla implementation of the ECMAScript Standard.

    In the early years, when the language attribute was widely used, you could for example specify "JavaScript1.2" to place code that was written for ECMAScript 2, but I wouldn’t recommend you this approach nowadays.

    The only reason you might want to specify a JavaScript(TM) version, is because you really need to use a Mozilla-specific extension, for example the let keyword, generators, iterators, expression closures, etc…

    See also:

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