           parentLink.classList.add('active');
                                }
                                currentLi = parentLi;
                            } else {
                                break;
                            }
                        }
                    }
                    break;
                }
            }
        }

        // 节流函数
        let ticking = false;
        function throttleScroll() {
            if (!ticking) {
                requestAnimationFram