1. define a function inside the class

             const handleClick = () => {
              console.log('Click happened');
            };

          

2. function call

            'use client'
            import React from 'react';

            export default function Home() {              

              const handleClick = () => {
                console.log('Click happened');
              };

              
              return (
                <div className='App'>
                  <h1>Hello React.</h1>
                  <h2>Start editing to see some magic happen! </h2>
                  <button onClick={handleClick}>Click Me</button>
                </div>
              );
              
            }