js点击按钮提示信息

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Click Button Example</title>
</head>
<body>
    <button id="myButton">Click Me</button>

    <script>
        document.getElementById('myButton').addEventListener('click', function() {
            alert('Button was clicked!');
        });
    </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Custom Alert Example</title>
    <style>
        #customAlert {
            display: none;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            padding: 20px;
            background-color: white;
            border: 1px solid black;
            box-shadow: 0 0 10px rgba(0,0,0,0.5);
        }
    </style>
</head>
<body>
    <button id="myButton">Click Me</button>
    <div id="customAlert">Button was clicked!</div>

    <script>
        document.getElementById('myButton').addEventListener('click', function() {
            var customAlert = document.getElementById('customAlert');
            customAlert.style.display = 'block';
            setTimeout(function() {
                customAlert.style.display = 'none';
            }, 3000); // Hide after 3 seconds
        });
    </script>
</body>
</html>