�事件处理（防抖）
        let keyboardDebounce = false;
        document.addEventListener('keydown', function(e) {
            // 防止在切换过程中重复触发
            if (isTransitioning) return;

            switch(e.key) {
                case 'ArrowLeft':
                    e.preventDefault();
                    if (!keyboardDebounce) {
                        keyboardDebounce = true;
                        previousSlide();
                        setTimeout(() => keyboardDebounce 