JavaScript Tutorial for Programmers - Embedding JavaScript
July 12, 1998
JavaScript code is typically embedded into an HTML document using
the SCRIPT tag. You are free to embed as many
scripts into a single document as you like,
using multiple SCRIPT tags. A script embedded in HTML
with the SCRIPT tag uses the format:
<script language="JavaScript">
<!--
document.write("Hello World!");
//-->
</script>
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The LANGUAGE attribute is optional, but recommended.
You may specify that a section of code only be executed
by browsers which support a particular version of JavaScript;
for instance:
<script language="JavaScript1.2">
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Another attribute of the SCRIPT tag, SRC, can be used to
include an external file containing JavaScript code
rather than code embedded into the HTML:
<script language="JavaScript" src="corefunctions.js">
</script>
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The external file is simply a text file containing JavaScript
code, and whose filename ends with the extension ".js".
Note that although some version 3 browsers support the SRC
attribute, it only functions reliably
across platforms in the version 4 browsers.
Scripts can be placed inside comment fields to ensure that your
JavaScript code is not displayed by old browsers
that do not recognize JavaScript.
The markup to begin a comment field is <!-- while you close a
comment field using //-->. This practice is certainly optional,
but considered good form when your page is likely to be visited
by older browsers. Certainly, as older browsers fade away,
this practice will likely become unnecessary.
JavaScript Tutorial for Programmers - Versions of JavaScript
JavaScript Tutorial for Programmers
JavaScript Tutorial for Programmers - JavaScript Grammar
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