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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<meta name="theme-color" content="#6366f1">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="default">
<meta name="apple-mobile-web-app-title" content="NCE Flow">
<link rel="icon" href="favicon.ico">
<link rel="apple-touch-icon" href="icons/apple-touch-icon.png">
<link rel="manifest" href="manifest.json">
<title>NCE Flow</title>
<link rel="stylesheet" href="assets/styles.css">
<!-- Microsoft Clarity 统计代码 -->
<script type="text/javascript">
(function (c, l, a, r, i, t, y) {
c[a] = c[a] || function () { (c[a].q = c[a].q || []).push(arguments) };
t = l.createElement(r); t.async = 1; t.src = "https://www.clarity.ms/tag/" + i;
y = l.getElementsByTagName(r)[0]; y.parentNode.insertBefore(t, y);
})(window, document, "clarity", "script", "tvjv632zgs");
</script>
<!-- Microsoft Clarity 代码结束 -->
<script src="assets/app.js" defer></script>
<script src="assets/search.js" defer></script>
<!-- 主题切换逻辑 -->
<script>
(function () {
const THEME_KEY = 'nce_theme';
// Icons
const SUN_ICON = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"></circle><line x1="12" y1="1" x2="12" y2="3"></line><line x1="12" y1="21" x2="12" y2="23"></line><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line><line x1="1" y1="12" x2="3" y2="12"></line><line x1="21" y1="12" x2="23" y2="12"></line><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line></svg>';
const MOON_ICON = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path></svg>';
function getPreferredTheme() {
const saved = localStorage.getItem(THEME_KEY);
if (saved) return saved;
return window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
}
function applyTheme(theme) {
const root = document.documentElement;
const scrollX = window.scrollX || 0;
const scrollY = window.scrollY || 0;
root.classList.remove('dark-theme', 'light-theme');
root.classList.add(theme + '-theme');
if (document.body) {
document.body.classList.remove('dark-theme', 'light-theme');
document.body.classList.add(theme + '-theme');
}
try { root.style.colorScheme = theme; } catch (_) { }
const computedBg = (() => {
try {
const base = document.body ? getComputedStyle(document.body) : getComputedStyle(root);
return base.getPropertyValue('--bg').trim();
} catch (_) {
return '';
}
})();
const bg = computedBg || (theme === 'dark' ? '#09090b' : '#ffffff');
root.style.backgroundColor = bg;
if (document.body) document.body.style.backgroundColor = bg;
void root.offsetHeight;
const btn = document.getElementById('themeToggleBtn');
if (btn) {
// If current is dark, show SUN to switch to light. If light, show MOON.
btn.innerHTML = theme === 'dark' ? SUN_ICON : MOON_ICON;
btn.setAttribute('aria-label', theme === 'dark' ? '切换到浅色模式' : '切换到深色模式');
}
if (document.body) {
requestAnimationFrame(() => {
// iOS/WKWebView: sometimes tiles don't repaint until a scroll happens.
const body = document.body;
const prevOpacity = body.style.opacity;
body.style.opacity = '0.99999';
const doc = document.documentElement;
const maxY = Math.max(0, doc.scrollHeight - window.innerHeight);
const y0 = Math.max(0, Math.min(scrollY, maxY));
const y1 = maxY ? (y0 < maxY ? y0 + 1 : Math.max(0, y0 - 1)) : y0;
window.scrollTo(scrollX, y1);
requestAnimationFrame(() => {
body.style.opacity = prevOpacity;
window.scrollTo(scrollX, y0);
});
});
}
}
function toggleTheme() {
const isDark = document.documentElement.classList.contains('dark-theme') ||
(document.body && document.body.classList.contains('dark-theme'));
const next = isDark ? 'light' : 'dark';
localStorage.setItem(THEME_KEY, next);
applyTheme(next);
}
function init() {
const theme = getPreferredTheme();
applyTheme(theme);
const btn = document.getElementById('themeToggleBtn');
if (btn) btn.addEventListener('click', toggleTheme);
}
if (window.matchMedia) {
const colorSchemeQuery = window.matchMedia('(prefers-color-scheme: dark)');
const handleSystemChange = (e) => {
if (!localStorage.getItem(THEME_KEY)) {
applyTheme(e.matches ? 'dark' : 'light');
}
};
if (colorSchemeQuery.addEventListener) colorSchemeQuery.addEventListener('change', handleSystemChange);
else if (colorSchemeQuery.addListener) colorSchemeQuery.addListener(handleSystemChange);
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
init();
}
})();
</script>
<script defer>
document.addEventListener('DOMContentLoaded', () => {
const container = document.getElementById('lessons');
const lastWrap = document.getElementById('lastSeenWrap');
const lastBox = document.getElementById('lastSeen');
const header = document.getElementById('bookTitle');
const segBooks = document.querySelectorAll('[data-book]');
const FAV_KEY = 'nce_favs';
const RECENT_KEY = 'nce_recents';
const getBook = () => (location.hash.slice(1) || 'NCE1').replace(/[^\w\d]/g, '');
function activeTab(book) { segBooks.forEach(b => b.classList.toggle('active', b.dataset.book === book)); }
async function load() {
try {
const res = await fetch('static/data.json');
if (!res.ok) {
console.error('Failed to fetch data.json:', res.status, res.statusText);
document.getElementById('lessons').innerHTML = '<div style="color: red; padding: 20px;">加载课程数据失败，请检查 static/data.json 文件</div>';
return;
}
const data = await res.json();
render(data);
} catch (error) {
console.error('Error loading data:', error);
document.getElementById('lessons').innerHTML = '<div style="color: red; padding: 20px;">网络错误或数据格式问题</div>';
}
}
function getFavs() { try { return new Set(JSON.parse(localStorage.getItem(FAV_KEY) || '[]')); } catch (_) { return new Set(); } }
function saveFavs(set) { try { localStorage.setItem(FAV_KEY, JSON.stringify(Array.from(set))); } catch (_) { } }
function lessonId(book, lesson) { return `${book}/${lesson.filename}`; }
function toLessonHref(book, lesson) { return `lesson.html#${book}/${lesson.filename}`; }
function fmtTime(t) { t = Math.max(0, Math.floor(t || 0)); const m = Math.floor(t / 60); const s = t % 60; return `${m}:${String(s).padStart(2, '0')}`; }
function itemHTML(book, lesson, idx, favs) {
const id = lessonId(book, lesson);
const isFav = favs.has(id);
const num = parseInt(book.replace('NCE', '')) || 1;
let lessonNumber = num === 1 ? `${idx * 2 + 1}&${idx * 2 + 2}` : String(idx + 1);
return `
<a class="lesson-item" href="${toLessonHref(book, lesson)}" data-id="${id}">
<div class="lesson-content">
<div class="lesson-num">第${lessonNumber}课</div>
<div class="lesson-title">${lesson.title}</div>
</div>
<button class="fav-btn ${isFav ? 'active' : ''}" role="button" aria-label="收藏" aria-pressed="${isFav}" data-id="${id}" onclick="event.preventDefault(); event.stopPropagation(); toggleFav('${id}')">
<svg viewBox="0 0 16 16" aria-hidden="true">
<path d="M8 12.027 3.297 14.5l.9-5.243L.1 5.997l5.258-.764L8 0l2.642 5.233 5.258.764-4.097 3.26.9 5.243L8 12.027Z"></path>
</svg>
</button>
</a>`;
}
function render(data) {
const book = getBook();
const num = parseInt(book.replace('NCE', '')) || 1;
// header.textContent = `新概念英语第${['一','二','三','四'][num-1]}册`;
activeTab(book);
const lessons = data[num] || [];
const favs = getFavs();
try {
const recRaw = JSON.parse(localStorage.getItem(RECENT_KEY) || '[]');
const rec = recRaw.filter(x => typeof x?.id === 'string' && x.id.startsWith(book + '/'))
.sort((a, b) => (b.ts || 0) - (a.ts || 0))[0];
if (rec) {
const i = lessons.findIndex(l => `${book}/${l.filename}` === rec.id);
if (i >= 0) {
const lesson = lessons[i];
let posTxt = '';
try {
const map = JSON.parse(localStorage.getItem('nce_lastpos') || '{}');
const lp = map[rec.id];
if (lp && (lp.idx >= 0 || lp.t >= 0)) {
const num = parseInt(book.replace('NCE', '')) || 1;
const lessonNumber = num === 1 ? `${i * 2 + 1}&${i * 2 + 2}` : String(i + 1);
const tt = (lp.t >= 0) ? fmtTime(lp.t) : '';
posTxt = [`第${lessonNumber}课`, tt].filter(Boolean).join(' · ');
}
} catch (_) { }
if (lastWrap && lastBox) {
lastWrap.style.display = '';
const href = toLessonHref(book, lesson);
lastBox.innerHTML = `
<a class="last-seen" href="${href}" data-id="${rec.id}" id="lastSeenLink">
<div class="lesson-content">
<div class="lesson-num">上次学习</div>
<div class="lesson-title">${lesson.title}</div>
${posTxt ? `<div style="font-size:13px;color:var(--muted);margin-top:4px">${posTxt}</div>` : ''}
</div>
<div style="flex:0 0 auto;width:20px;height:20px;color:var(--text);display:flex;align-items:center;justify-content:center">→</div>
</a>`;
}
} else {
if (lastWrap && lastBox) { lastWrap.style.display = 'none'; lastBox.innerHTML = ''; }
}
} else {
if (lastWrap && lastBox) { lastWrap.style.display = 'none'; lastBox.innerHTML = ''; }
}
} catch (_) { }
const existingGrid = container.querySelector('.lessons-grid');
if (existingGrid) {
existingGrid.innerHTML = lessons.map((l, i) => itemHTML(book, l, i, favs)).join('');
} else {
const gridDiv = document.createElement('div');
gridDiv.className = 'lessons-grid';
gridDiv.innerHTML = lessons.map((l, i) => itemHTML(book, l, i, favs)).join('');
container.appendChild(gridDiv);
}
}
window.addEventListener('hashchange', load, { passive: true });
NCE_APP.initSegmented(document);
window.toggleFav = function (id) {
if (!id) return;
const favs = getFavs();
if (favs.has(id)) favs.delete(id); else favs.add(id);
saveFavs(favs);
(async () => {
const res = await fetch('static/data.json');
const data = await res.json();
render(data);
})();
};
document.addEventListener('click', (e) => {
const a = e.target.closest('#lastSeenLink');
if (!a) return;
const id = a.dataset.id;
try { sessionStorage.setItem('nce_resume', id); sessionStorage.setItem('nce_resume_play', '1'); } catch (_) { }
});
load();
});
</script>
<style>
.tabs {
display: flex;
gap: 6px;
justify-content: center;
margin: 8px 0
}
</style>
</head>
<body>
<canvas id="bg-canvas"></canvas>
<div class="container">
<header class="hero">
<div class="header-actions">
<button id="searchBtn" class="icon-btn search-trigger" aria-label="搜索">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"
stroke-linejoin="round">
<circle cx="11" cy="11" r="8"></circle>
<line x1="21" y1="21" x2="16.65" y2="16.65"></line>
</svg>
</button>
<button id="themeToggleBtn" class="icon-btn theme-toggle" aria-label="切换主题">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path>
</svg>
</button>
</div>
<h1 id="bookTitle">NCE Flow</h1>
<p class="subtitle">简约 · 高效 · 专注</p>
<div class="seg-wrap">
<div class="segmented tabs" role="tablist" aria-label="册别">
<a class="seg" href="#NCE1" data-book="NCE1">第一册</a>
<a class="seg" href="#NCE2" data-book="NCE2">第二册</a>
<a class="seg" href="#NCE3" data-book="NCE3">第三册</a>
<a class="seg" href="#NCE4" data-book="NCE4">第四册</a>
<a class="seg" href="favorites.html" id="favoritesLinkHome">清单</a>
</div>
</div>
</header>
<!-- Search Modal -->
<div id="searchModal" class="search-overlay" hidden>
<div class="search-container">
<div class="search-header">
<div class="search-input-wrapper">
<svg class="search-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<circle cx="11" cy="11" r="8"></circle>
<line x1="21" y1="21" x2="16.65" y2="16.65"></line>
</svg>
<input type="text" id="searchInput" placeholder="搜索句子、单词或课文..." autocomplete="off">
<button id="searchClear" class="search-clear" hidden>×</button>
</div>
<button id="searchClose" class="search-cancel">取消</button>
</div>
<div class="search-body">
<div id="searchResults" class="search-results"></div>
<div id="searchEmpty" class="search-empty" hidden>
<div class="empty-icon">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<circle cx="11" cy="11" r="8"></circle>
<line x1="21" y1="21" x2="16.65" y2="16.65"></line>
</svg>
</div>
<p>未找到相关内容</p>
</div>
<div id="searchLoading" class="search-loading" hidden>
<div class="spinner"></div>
</div>
</div>
</div>
</div>
<main class="lessons" id="lessons">
<section class="section last-seen-section" id="lastSeenWrap" style="display:none">
<div id="lastSeen"></div>
</section>
</main>
<footer>
<p class="repo">
<a class="gh-link" href="https://github.com/luzhenhua/NCE-Flow" target="_blank" rel="noopener"
aria-label="GitHub repository">
<svg viewBox="0 0 16 16" aria-hidden="true" focusable="false">
<path
d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0 0 16 8c0-4.42-3.58-8-8-8Z">
</path>
</svg>
</a>
</p>
<p class="byline">本网站由 <a href="https://luzhenhua.cn/" target="_blank" rel="noopener">卢振华</a> 开发与维护</p>
<p class="version"><a href="https://github.com/luzhenhua/NCE-Flow/releases" target="_blank" rel="noopener">版本
1.7.8</a><span id="pwaFooterInstall" class="pwa-footer-link" hidden> · <a href="#">安装应用</a></span></p>
<div class="footer-actions">
<a class="footer-btn" href="about.html">关于</a>
</div>
</footer>
</div>
<script>
// Particle Background Animation
(function () {
const cvs = document.getElementById('bg-canvas');
if (!cvs) return;
const ctx = cvs.getContext('2d');
const DPR_CAP = 1.5;
const TARGET_FPS = 30;
const FRAME_MS = 1000 / TARGET_FPS;
const BASE_FRAME_MS = 1000 / 60;
let particles = [];
let lastRenderTs = 0;
function resize() {
const dpr = Math.min(window.devicePixelRatio || 1, DPR_CAP);
cvs.width = Math.floor(innerWidth * dpr);
cvs.height = Math.floor(innerHeight * dpr);
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
cvs.style.width = innerWidth + 'px';
cvs.style.height = innerHeight + 'px';
}
window.addEventListener('resize', resize);
class Particle {
constructor() {
this.x = Math.random() * innerWidth;
this.y = Math.random() * innerHeight;
this.vx = (Math.random() - .5) * .3;
this.vy = (Math.random() - .5) * .3;
this.r = Math.random() * 1.2 + .5;
}
update(step) {
this.x += this.vx * step;
this.y += this.vy * step;
if (this.x < 0 || this.x > innerWidth) this.vx *= -1;
if (this.y < 0 || this.y > innerHeight) this.vy *= -1;
}
draw() {
ctx.beginPath();
ctx.arc(this.x, this.y, this.r, 0, Math.PI * 2);
ctx.fillStyle = isDark() ? 'rgba(255,255,255,0.4)' : 'rgba(0,0,0,0.25)';
ctx.fill();
}
}
function isDark() {
return document.documentElement.classList.contains('dark-theme') ||
document.body.classList.contains('dark-theme');
}
function drawLines() {
const maxDist = 100;
const maxDistSq = maxDist * maxDist;
for (let i = 0; i < particles.length; i++) {
for (let j = i + 1; j < particles.length; j++) {
const dx = particles[i].x - particles[j].x,
dy = particles[i].y - particles[j].y;
const distSq = dx * dx + dy * dy;
if (distSq < maxDistSq) {
const dist = Math.sqrt(distSq);
ctx.beginPath();
ctx.moveTo(particles[i].x, particles[i].y);
ctx.lineTo(particles[j].x, particles[j].y);
ctx.strokeStyle = isDark()
? `rgba(255,255,255,${1 - dist / maxDist})`
: `rgba(0,0,0,${.5 - dist / (maxDist * 2)})`;
ctx.lineWidth = .5;
ctx.stroke();
}
}
}
}
function init() {
resize();
particles = Array.from({ length: Math.floor(innerWidth * innerHeight / 18000) }, () => new Particle());
requestAnimationFrame(animate);
}
function animate(ts) {
requestAnimationFrame(animate);
if (!lastRenderTs) lastRenderTs = ts;
const elapsed = ts - lastRenderTs;
if (elapsed < FRAME_MS) return;
lastRenderTs = ts - (elapsed % FRAME_MS);
const step = Math.min(elapsed / BASE_FRAME_MS, 5);
ctx.clearRect(0, 0, innerWidth, innerHeight);
particles.forEach(p => { p.update(step); p.draw(); });
drawLines();
}
init();
})();
</script>
<script>
// 注册 Service Worker
if ('serviceWorker' in navigator) {
window.addEventListener('load', () => {
navigator.serviceWorker.register('/sw.js')
.then((reg) => {
console.log('[PWA] Service Worker 注册成功');
reg.update();
if (reg.waiting) {
reg.waiting.postMessage({ type: 'SKIP_WAITING' });
}
reg.addEventListener('updatefound', () => {
const newWorker = reg.installing;
if (!newWorker) return;
newWorker.addEventListener('statechange', () => {
if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
newWorker.postMessage({ type: 'SKIP_WAITING' });
}
});
});
// Show update notification instead of auto-refresh
navigator.serviceWorker.addEventListener('controllerchange', () => {
showUpdateNotification();
});
})
.catch(err => console.log('[PWA] Service Worker 注册失败:', err));
});
}
function showUpdateNotification() {
// Prevent duplicate notifications
if (document.getElementById('updateNotification')) return;
const notification = document.createElement('div');
notification.id = 'updateNotification';
notification.innerHTML = `
<span>🎉 新版本已就绪</span>
<button onclick="window.location.reload()">点击刷新</button>
`;
notification.style.cssText = `
position: fixed;
bottom: 80px;
left: 50%;
transform: translateX(-50%);
background: var(--text, #1d1d1f);
color: var(--bg, #fff);
padding: 12px 20px;
border-radius: 12px;
display: flex;
align-items: center;
gap: 12px;
box-shadow: 0 4px 20px rgba(0,0,0,0.15);
z-index: 9999;
font-size: 14px;
animation: slideUp 0.3s ease;
`;
notification.querySelector('button').style.cssText = `
background: var(--accent, #3b82f6);
color: #fff;
border: none;
padding: 6px 14px;
border-radius: 8px;
font-size: 13px;
cursor: pointer;
font-weight: 500;
`;
document.body.appendChild(notification);
}
</script>
<!-- PWA Install Prompt -->
<div id="pwaPrompt" class="pwa-prompt">
<img src="icons/icon-192x192.png" alt="" class="pwa-prompt-icon">
<div class="pwa-prompt-content">
<span class="pwa-prompt-title">安装 NCE Flow</span>
<span class="pwa-prompt-sub" id="pwaPromptSub">添加到主屏幕，随时学习</span>
</div>
<button id="pwaInstall" class="pwa-prompt-btn">安装</button>
<span id="pwaClose" class="pwa-prompt-close">×</span>
</div>
<script>
(function () {
const DISMISS_KEY = 'pwa_dismissed';
const INSTALLED_KEY = 'pwa_installed';
let deferredPrompt = null;
const el = document.getElementById('pwaPrompt');
const installBtn = document.getElementById('pwaInstall');
const closeBtn = document.getElementById('pwaClose');
const promptSub = document.getElementById('pwaPromptSub');
const footerInstall = document.getElementById('pwaFooterInstall');
if (!el) return;
// 检测 iOS Safari
const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) || (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1);
const isSafari = /Safari/.test(navigator.userAgent) && !/Chrome|CriOS|FxiOS/.test(navigator.userAgent);
const isIOSSafari = isIOS && isSafari;
const isStandalone = window.matchMedia('(display-mode:standalone)').matches || navigator.standalone;
const isInstalled = () => isStandalone || localStorage.getItem(INSTALLED_KEY);
const isDismissed = () => { const d = localStorage.getItem(DISMISS_KEY); return d && (Date.now() - parseInt(d)) < 7 * 24 * 60 * 60 * 1000; };
const showPrompt = () => {
if (isInstalled() || isDismissed()) return;
if (!deferredPrompt && !isIOSSafari) return;
el.classList.add('show');
};
const hidePrompt = () => el.classList.remove('show');
const showFooterLink = () => { if (footerInstall && !isInstalled()) footerInstall.hidden = false; };
const hideFooterLink = () => { if (footerInstall) footerInstall.hidden = true; };
// iOS 引导界面
const showIOSGuide = () => {
el.classList.add('ios-prompt');
promptSub.innerHTML = '点击底部 <svg class="ios-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M4 12v8a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-8"/><polyline points="16 6 12 2 8 6"/><line x1="12" y1="2" x2="12" y2="15"/></svg> 然后选择「添加到主屏幕」';
installBtn.textContent = '知道了';
installBtn.onclick = hidePrompt;
};
const doInstall = async () => {
// iOS Safari: 点击后显示引导
if (isIOSSafari) {
showIOSGuide();
return;
}
// Chrome/Edge: 标准安装流程
if (!deferredPrompt) return;
deferredPrompt.prompt();
const { outcome } = await deferredPrompt.userChoice;
if (outcome === 'accepted') localStorage.setItem(INSTALLED_KEY, '1');
deferredPrompt = null;
hidePrompt();
hideFooterLink();
};
// iOS Safari: 延迟显示提示（与 Android 相同的初始界面）
if (isIOSSafari && !isInstalled() && !isDismissed()) {
showFooterLink();
setTimeout(showPrompt, 2500);
}
// Chrome/Edge: 标准安装流程
window.addEventListener('beforeinstallprompt', e => {
e.preventDefault();
deferredPrompt = e;
showFooterLink();
setTimeout(showPrompt, 2500);
});
installBtn.addEventListener('click', doInstall);
if (footerInstall) {
footerInstall.querySelector('a').addEventListener('click', e => {
e.preventDefault();
showPrompt();
});
}
closeBtn.addEventListener('click', () => { localStorage.setItem(DISMISS_KEY, Date.now()); hidePrompt(); });
window.addEventListener('appinstalled', () => { localStorage.setItem(INSTALLED_KEY, '1'); hidePrompt(); hideFooterLink(); });
})();
</script>
<!-- Copyright Confirmation Modal -->
<div id="copyrightModal" class="modal-overlay" style="display: none;">
<div class="modal-card">
<div class="modal-icon">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"></path>
</svg>
</div>
<h3 class="modal-title">正版承诺</h3>
<p class="modal-text">本网站仅供新概念英语学习者辅助使用。使用本网站前，请确认您已购买正版新概念英语，拒绝任何形式的盗版书籍。</p>
<div class="modal-checkbox-wrapper">
<input type="checkbox" id="copyrightCheck">
<label for="copyrightCheck">我已购买正版新概念英语书籍</label>
</div>
<button id="copyrightConfirmBtn" class="modal-btn" disabled>进入学习</button>
</div>
</div>
<script>
(function () {
const KEY = 'nce_copyright_confirmed';
const modal = document.getElementById('copyrightModal');
const checkbox = document.getElementById('copyrightCheck');
const btn = document.getElementById('copyrightConfirmBtn');
if (!modal || !checkbox || !btn) return;
// Check if already confirmed
const confirmed = localStorage.getItem(KEY);
if (!confirmed) {
modal.style.display = 'flex';
// Disable scroll
document.body.style.overflow = 'hidden';
}
checkbox.addEventListener('change', (e) => {
btn.disabled = !e.target.checked;
});
btn.addEventListener('click', () => {
if (checkbox.checked) {
localStorage.setItem(KEY, '1');
modal.style.opacity = '0';
setTimeout(() => {
modal.style.display = 'none';
document.body.style.overflow = '';
}, 300);
}
});
})();
</script>
</body>
</html>