Where should I put JavaScript? Are scripts executed automatically? What is an external script? How do I use an external script?
It depends. You have three choices. Since a web page can have multiple scripts, you can use them all on the same page! Scripts can be in the <head> section, the <body> section, or an external file.
Scripts in the <head> section are loaded first, before the rest of the web page is loaded. Scripts in the <body> section are loaded at their position on the web page.
Not all scripts are executed automatically. Scripts with functions are not executed until they are called. You will learn that a script can be called when it is triggered by an event. One such event is clicking a button.
An external script is saved in a separate file, like an external style sheet. By convention, the filename with javaScript scripts ends with .js (for JavaScript, naturally).
In the <script> tag, add the src attribute to identify the location of the JavaScript file; for example:
<script src="global.js"></script>
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This tutorial will help you to learn the basics of JavaScript and write your own JavaScript codes
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