CS50-Web-Programming-with-Python-and-JavaScript/lecture5/storage.html at master · python-test-code/CS50-Web-Programming-with-Python-and-JavaScript · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <script>

            // Set starting value of counter to 0
            if (!localStorage.getItem('counter'))
                localStorage.setItem('counter', 0);

            // Load current value of  counter
            document.addEventListener('DOMContentLoaded', () => {
                document.querySelector('#counter').innerHTML = localStorage.getItem('counter');

                // Count every time button is clicked
                document.querySelector('button').onclick = () => {
                    // Increment current counter
                    let counter = localStorage.getItem('counter');
                    counter++;

                    // Update counter
                    document.querySelector('#counter').innerHTML = counter;
                    localStorage.setItem('counter', counter);
                }
            });

        </script>
        <title>My Website</title>
    </head>
    <body>
        <h1 id="counter"></h1>
        <button>Click Here!</button>
    </body>
</html>