Before starting an example let us discuss how JavaScript can display the data.
JavaScript ways of data display:
1. window.alert(): Display data in an alert box.
2. document.write(): Display data into the HTML output.
3. innerHTML: Display data into an HTML element.
4. console.log(): Display data into the browser console.
Javascript in head tag example:
<html> <head> <script type="text/javascript"> alert("Hello w3schools.com"); </script> </head> </html>
Try it:
<html>
Javascript in body tag example:
<body> <script type="text/javascript"> alert("Hello w3schools.com"); </script> </body> </html>
Try it:
Javascript in head and body tag example:
<html> <head> <script type="text/javascript"> function sayHello(){ alert("Hello w3schools.com"); } </script> </head> <body> <p>Hello World Javascript Example.</p> <form> <input type="button" value="Say Hello" onclick="sayHello()"/> </form> </body> </html>