Adding JavaScript to HTML

Between the <script> and </script> elements in HTML, JavaScript code is placed. An HTML document can contain any number of scripts. Scripts can be placed in the <body>, the <head>, or both sections of an HTML page.

<head>  
	<script>    
		alert("Hello");  
	</script>
</head>

A JavaScript function is placed in the <head> section of an HTML page in this example.

<body>  
	<!-- your content goes here -->  
	<script>    
		alert("Hello");  
	</script>
</body>

A JavaScript function is placed in the <body> section of an HTML page in this example.

main.js

alert("Hello");

index.html

<script src="main.js"></script>

Create a .js script file, such as main.js, and place it in the head or body of the html document.