Function:
- Function performs any task using pre-defined set of instructions.
- Functions must be defined with keyword called ‘function’
| Syntax: | Example: |
| function identity() { ….. Logic ….. } | function add() { var a=10, b=20; var c = a+b; print(c); } |
Note: We always perform operations when action performed. For example, display alert message when user clicks on button
| <html> <head> <script> function clickMe() { alert(“Hello”); } </script> </head> <body> <h2> JavaScript Alert Box </h2> <button onclick=”clickMe()”>Click Me</button> </body> </html> |
document.write():
- “document” is a pre-defined object in JavaScript.
- “document” represents “webpage”.
- write() is a pre-defined method to display information.
- If we invoke write() method on document object then it writes the information on webpage