Browsers that do not support JavaScript, will display JavaScript as page content.
To prevent them from doing this, and as a part of the JavaScript standard, the HTML comment tag should be used to "hide" the JavaScript.
Just add an HTML comment tag <!-- before the first JavaScript statement, and a --> (end of comment) after the last JavaScript statement, like this:
|
<html>
<body> <script type="text/javascript"> <!-- document.write("Hello World!"); //--> </script> </body> </html> |
JavaScript Where To
JavaScripts in the body section
will be executed WHILE the page loads.
JavaScripts in the head section
will be executed when CALLED.
Where to Put the JavaScript
JavaScripts in a page will be
executed immediately while the page loads into the browser. This is not always
what we want. Sometimes we want to execute a script when a page loads, other
times when a user triggers an event.
Scripts in <head>
Scripts to be executed when they
are called, or when an event is triggered, go in the head section.If you place a script in the head section, you will ensure that the script is loaded before anyone uses it.
Example
 |
Scripts in <body>
Scripts to be executed when the
page loads go in the body section.If you place a script in the body section, it generates the content of a page.
Example
|
Scripts in <head> and <body>
You can place an unlimited number
of scripts in your document, so you can have scripts in both the body and the
head section.|
<html>
<head> <script type="text/javascript"> .... </script> </head> <body> <script type="text/javascript"> .... </script> </body> |
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