自动回车js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Auto Enter Example</title>
</head>
<body>
    <textarea id="autoEnterTextarea" rows="10" cols="30"></textarea>

    <script>
        document.getElementById('autoEnterTextarea').addEventListener('keydown', function(event) {
            if (event.key === 'Enter' && !event.shiftKey) {
                event.preventDefault(); // 阻止默认的回车行为
                const start = this.selectionStart;
                const end = this.selectionEnd;
                this.value = this.value.substring(0, start) + '\n' + this.value.substring(end);
                this.selectionStart = this.selectionEnd = start + 1; // 将光标移动到下一行
            }
        });
    </script>
</body>
</html>