js点击button提交表单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Form Submission</title>
</head>
<body>
    <form id="myForm">
        <input type="text" name="username" placeholder="Username" required>
        <input type="password" name="password" placeholder="Password" required>
        <button type="button" id="submitBtn">Submit</button>
    </form>

    <script>
        document.getElementById('submitBtn').addEventListener('click', function() {
            const form = document.getElementById('myForm');
            const formData = new FormData(form);

            fetch('/submit', {
                method: 'POST',
                body: formData
            })
            .then(response => response.json())
            .then(data => {
                console.log('Success:', data);
                alert('Form submitted successfully!');
            })
            .catch((error) => {
                console.error('Error:', error);
                alert('There was an error submitting the form.');
            });
        });
    </script>
</body>
</html>