jquery 点击空白事件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery Click Outside Example</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        #popup {
            display: none;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            padding: 20px;
            background-color: white;
            border: 1px solid black;
        }
    </style>
</head>
<body>
    <button id="openPopup">Open Popup</button>
    <div id="popup">This is a popup!</div>

    <script>
        $(document).ready(function() {
            $('#openPopup').click(function() {
                $('#popup').show();
            });

            $(document).click(function(event) {
                if (!$(event.target).closest('#popup').length && !$(event.target).is('#openPopup')) {
                    $('#popup').hide();
                }
            });
        });
    </script>
</body>
</html>