Debug function
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/*
Examples From
JavaScript: The Definitive Guide, Fourth Edition
Legal matters: these files were created by David Flanagan, and are
Copyright (c) 2001 by David Flanagan. You may use, study, modify, and
distribute them for any purpose. Please note that these examples are
provided "as-is" and come with no warranty of any kind.
David Flanagan
*/
<html>
<script>
var _console = null;
function debug(msg)
{
// Open a window the first time we are called, or after an existing
// console window has been closed.
if ((_console == null) || (_console.closed)) {
_console = window.open("","console","width=600,height=300,resizable");
// Open a document in the window to display plain text.
_console.document.open("text/plain");
}
_console.focus(); // Make the window visible
_console.document.writeln(msg); // Output the message to it
// Note that we purposely do not call close(). By leaving the
// document open we are able to append to it later.
}
</script>
<!-- Here's an example of using this script. -->
<script>var n = 0;</script>
<form>
<input type="button" value="Push Me"
onclick="debug('You have pushed me:t' + ++n + ' times.');">
</html>
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