How to Update Multiple Web Pages Using JavaScript

Using JavaScript, you can create a separate file which contains
content for your web page. To update all the pages simultaneously,
simply update the JavaScript file.

Pros:

• Easy to implement.
• Does not rely on any special HTML extension or server configuration.

Cons:

• Relies on the user having JavaScript enabled.
• Updates are more tricky than other methods.

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Step 1: Create JavaScript File

Create a plain text document and name it with a .js
extension, for example masterscript.js.
Using the JavaScript document.write
method, enter the content you want to be displayed on every page
like so:

document.write("<div style='color:blue; font-size:12pt;'>");

document.write("© Copyright Myname 2004");

document.write("</div>");

Note: You don't need to include script tags in this file.

Step 2: Add JavaScript Code to Pages

On every page where you want the content to appear, insert the
following code:

<script language="JavaScript" type="text/javascript"
src="masterscript.js">

</script>

To change the content on every page, edit the contents of the masterscript.js file.