- JavaScript in Body
- JavaScript in Head
- External JavaScript
1.JavaScript in Body
<!DOCTYPE html> <html> <body> <script> alert("Hello World!"); </script> </body> </html>
2.JavaScript in Head
<!DOCTYPE html> <html> <head> <script> function myFunction() { alert("Hello World!"); } </script> </head> <body> <button type="button" onclick="myFunction()">Click me</button> </body> </html>
3.External JavaScript
<!DOCTYPE html> <html> <head> <script src="myScript.js"></script> </head> <body> <button type="button" onclick="myFunction()">Click me</button> </body> </html>