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The following is taken from the Netscape Navigator 3.0
JavaScript Guide:
JavaScript statements within a <SCRIPT> tag with a
SRC attribute are ignored unless the inclusion has an error. For example, you
might want to put the following statement between the <SCRIPT
SRC="..."> and </SCRIPT> statements:
document.write("Included JS file not found")
The SRC attribute can specify any URL, relative or absolute. For example:
<SCRIPT SRC="http://home.netscape.com/functions/jsfuncs.js">
External JavaScript files cannot contain any HTML tags: they must contain only
JavaScript statements and function definitions.
External JavaScript files should have the file name suffix .js, and the server
must map the .js suffix to the MIME type "application/x-JavaScript",
which the server sends back in the HTTP header. To map the suffix to the MIME
type, add the following line to the mime.types file in the server's config
directory, and then restart the server.
type=application/x-JavaScript exts=js
If the server does not map the .js filename suffix to
"application/x-JavaScript" MIME type, Navigator will not load the
JavaScript file specified by the SRC attribute properly.
Note This requirement does not apply if you are using local files.
Internet Explorer 3.0 does not support this feature of
JavaScript, however Internet Explorer does support floating frames which can
reference another HTML file using the following syntax.
<iframe
align=left|center|right|top|bottom
frameborder=1|0
height=height
marginheight=height
marginwidth=width
name=name
scrolling=yes|no
src=address
width=width>
<\/iframe>
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Netscape does not support floating frames (yet) - which
leads to interesting possibilities, for example:
<script language="JavaScript"><!--
if (navigator.appVersion.indexOf('MSIE 3') != -1)
document.write('<iframe frameborder="0" width="100%"
height="100" marginheight="5" marginwidth="5" name=
"cookie" scrolling="no" src="cookie.htm"><\/iframe>');
else
document.write('<script language="JavaScript" src="cookie.js">
</script>');
//--></script>
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The above code, is more complicated than I originally
intended. However, certain versions of MSIE 3.02 support JavaScript *.js source
files (although MSIE 3.02 does have certain limitations - see the following
article for further information Internet
Explorer 3.02 and SRC files.
Since the introduction of MSIE 4 - there is now full
support for JavaScript *.js source files. So the above code loads the cookie.htm
file for MSIE 3, and for the remainder it loads the cookie.js file.
cookie.js must only contain JavaScript:
fortune = new Array(59);
fortune[0] = "<center>The goal of Computer Science is to build
something that will last at least until we've finished building it.";
fortune[1] = "<center>The <I>first</I> deadly sin is to code
before you think.";
fortune[2] = "<center>The <I>second</I> deadly sin is to assume
the user has all the knowledge the software writer has.";
fortune[3] = "<center>The <I>third</I> deadly sin is not to
write proper documentation.";
fortune[4] = "<center>The <I>fourth</I> deadly sin is to ignore
language standards.";
fortune[5] = "<center>The <I>fifth</I> deadly sin is to treat error
diagnosis as an afterthought.";
fortune[6] = "<center>The <I>sixth</I> deadly sin is to equate the
unlikely with the impossible.";
...
...
fortune[43] = "<center>There are two ways to write error-free programs.
Only the third one works.";
var now=new Date();document.write("<hr><font size=-1>
",fortune[now.getSeconds()%43],"</font>");
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Whereas cookie.htm can actually contain HTML as well as
JavaScript:
<html>
<body onLoad="window.setTimeout('RefreshScreen()',10000)">
<script language="JavaScript"><!--
function RefreshScreen() { window.location.href = self.location.href; }
fortune = new Array(59);
fortune[0] = "<center>The goal of Computer Science is to build something
that will last at least until we've finished building it.";
fortune[1] = "<center>The <I>first<\/I> deadly sin is to code
before you think.";
fortune[2] = "<center>The <I>second<\/I> deadly sin is to assume the user
has all the knowledge the software writer has.";
fortune[3] = "<center>The <I>third<\/I> deadly sin is not to write proper
documentation.";
fortune[4] = "<center>The <I>fourth<\/I> deadly sin is to ignore language
standards.";
fortune[5] = "<center>The <I>fifth<\/I> deadly sin is to treat error
diagnosis as an afterthought.";
fortune[6] = "<center>The <I>sixth<\/I> deadly sin is to equate the
unlikely with the impossible.";
...
...
fortune[43] = "<center>There are two ways to write error-free programs.
Only the third one works.";
var now=new Date();document.write("<hr><font size=-1>
",fortune[now.getSeconds()%43],"<\/font>");
//--></script>
</body>
</html>
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Depending on which browser you are using you will see
below either the output from cookie.js or cookie.htm:
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