张翔
37296b5717
改造概要（30项）： - 第一轮：Hero重构/Section差异化/SocialProof强化/CTA对比度/About架构 - 第二轮：字体优化/背景交替/Solutions差异化/Footer五列/MegaDropdown修复 - 第三轮：卡片交互/表单层级/CTA统一/时间线标记/连接线/三列布局/移动导航/Button微交互/SEO Schema - P3-2：template.tsx+Framer Motion页面过渡/loading.tsx加载状态 - 清理：删除未用组件/hooks，修复重复移动导航，清理冗余CSS
53 lines
1.9 KiB
TypeScript
53 lines
1.9 KiB
TypeScript
'use client';
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import { useState, useEffect } from 'react';
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import { motion, AnimatePresence } from 'framer-motion';
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import { ArrowUp } from 'lucide-react';
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import { useReducedMotion } from '@/hooks/use-reduced-motion';
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export function BackToTop() {
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const [isVisible, setIsVisible] = useState(false);
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const shouldReduceMotion = useReducedMotion();
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useEffect(() => {
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const handleScroll = () => {
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// 当滚动超过 500px 时显示按钮
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setIsVisible(window.scrollY > 500);
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};
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window.addEventListener('scroll', handleScroll, { passive: true });
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return () => window.removeEventListener('scroll', handleScroll);
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}, []);
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const scrollToTop = () => {
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window.scrollTo({
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top: 0,
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behavior: shouldReduceMotion ? 'auto' : 'smooth',
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});
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};
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return (
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<AnimatePresence>
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{isVisible && (
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<motion.button
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initial={shouldReduceMotion ? {} : { opacity: 0, y: 20, scale: 0.8 }}
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animate={{ opacity: 1, y: 0, scale: 1 }}
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exit={shouldReduceMotion ? {} : { opacity: 0, y: 20, scale: 0.8 }}
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transition={{ duration: 0.2, ease: 'easeOut' }}
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onClick={scrollToTop}
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className="fixed right-4 bottom-20 md:bottom-8 md:right-8 z-40 p-3 bg-[var(--color-brand-primary)] text-white rounded-full shadow-lg hover:bg-[var(--color-brand-primary-hover)] hover:shadow-xl transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-[var(--color-brand-primary)] focus:ring-offset-2"
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aria-label="返回顶部"
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title="返回顶部"
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style={{
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boxShadow: '0 4px 14px rgba(var(--color-brand-primary-rgb), 0.4)',
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}}
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whileHover={shouldReduceMotion ? {} : { scale: 1.1 }}
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whileTap={shouldReduceMotion ? {} : { scale: 0.95 }}
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>
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<ArrowUp className="w-6 h-6" />
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</motion.button>
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)}
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</AnimatePresence>
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);
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}
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