Executing javascript

Javascript is an Event driven scripting language.

Javascript programs are only executed in response to some Event.
An Event could be a mouse click, a page load, a button being clicked etc.

You decide which events are used to trigger which pieces of code.

Javascript is linked to web pages in three main ways,

• as an Inline script
• as an Internal script or
• in a separate file called an External script with a .js extension.

You can even use all three at the same time.

It is fairly widely accepted that external js files are the best way to add javascript to a page.
Using external js files helps with the concept of separating content from behaviour.

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