mirror of
https://github.com/Vb-Lg/class-history-template.git
synced 2026-11-03 18:46:40 +00:00
282 lines
9.6 KiB
JavaScript
282 lines
9.6 KiB
JavaScript
/* ================= 星空背景 ================= */
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(function () {
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const canvas = document.getElementById('stars');
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const ctx = canvas.getContext('2d');
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let w, h, stars = [], dpr = Math.min(window.devicePixelRatio || 1, 2);
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function resize() {
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w = canvas.width = window.innerWidth * dpr;
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h = canvas.height = window.innerHeight * dpr;
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canvas.style.width = window.innerWidth + 'px';
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canvas.style.height = window.innerHeight + 'px';
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const count = Math.min(160, Math.floor(window.innerWidth / 9));
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stars = Array.from({ length: count }, () => ({
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x: Math.random() * w,
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y: Math.random() * h,
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r: (Math.random() * 1.4 + .3) * dpr,
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a: Math.random() * .6 + .15,
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s: Math.random() * .0009 + .0003,
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dy: Math.random() * .05 + .015
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}));
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}
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let t = 0;
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function draw() {
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ctx.clearRect(0, 0, w, h);
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t += 1;
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for (const s of stars) {
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const alpha = s.a + Math.sin(t * s.s * 12) * .25;
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ctx.beginPath();
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ctx.arc(s.x, s.y, s.r, 0, Math.PI * 2);
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ctx.fillStyle = 'rgba(255,244,214,' + Math.max(0.03, Math.min(1, alpha)) + ')';
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ctx.fill();
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s.y += s.dy * dpr;
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if (s.y > h + 5) { s.y = -5; s.x = Math.random() * w; }
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}
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requestAnimationFrame(draw);
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}
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resize();
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window.addEventListener('resize', resize);
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draw();
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})();
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/* ================= 打字机 ================= */
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(function () {
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const el = document.getElementById('typed');
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const lines = [
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'我们的故事，从那年秋天开始',
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'三年同窗，一生朋友',
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'愿此去前程似锦，再相逢依然少年'
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];
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let li = 0, ci = 0, deleting = false;
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function tick() {
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const cur = lines[li];
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if (!deleting) {
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ci++;
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el.textContent = cur.slice(0, ci);
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if (ci === cur.length) {
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deleting = true;
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return setTimeout(tick, 1800);
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}
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return setTimeout(tick, 95);
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} else {
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ci--;
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el.textContent = cur.slice(0, ci);
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if (ci === 0) {
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deleting = false;
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li = (li + 1) % lines.length;
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return setTimeout(tick, 350);
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}
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return setTimeout(tick, 40);
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}
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}
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setTimeout(tick, 900);
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})();
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/* ================= 滚动出现 ================= */
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(function () {
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const els = document.querySelectorAll('.reveal');
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if (!('IntersectionObserver' in window)) {
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els.forEach(e => e.classList.add('visible'));
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return;
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}
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const io = new IntersectionObserver((entries) => {
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entries.forEach((entry) => {
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if (entry.isIntersecting) {
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const el = entry.target;
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// 延时随文档顺序单调不减（不能取模：那样第 7 个延时回到 0，
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// 会先于它上面的元素出现），到第 6 级后不再累加。
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const idx = Array.from(el.parentElement.children).indexOf(el);
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const delay = Math.min(idx, 6) * 70;
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setTimeout(() => el.classList.add('visible'), delay);
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io.unobserve(el);
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}
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});
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}, { threshold: .12, rootMargin: '0px 0px -60px 0px' });
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els.forEach(e => io.observe(e));
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})();
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/* ================= 数字滚动 ================= */
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(function () {
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const nums = document.querySelectorAll('[data-count]');
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const io = new IntersectionObserver((entries) => {
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entries.forEach(entry => {
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if (!entry.isIntersecting) return;
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const el = entry.target;
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const target = parseInt(el.dataset.count, 10);
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const suffix = target === 999 ? '+' : '';
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let start = null;
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const dur = 1600;
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function step(ts) {
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if (!start) start = ts;
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const p = Math.min((ts - start) / dur, 1);
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const eased = 1 - Math.pow(1 - p, 3);
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el.textContent = Math.floor(target * eased) + suffix;
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if (p < 1) requestAnimationFrame(step);
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else el.textContent = target + suffix;
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}
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requestAnimationFrame(step);
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io.unobserve(el);
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});
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}, { threshold: .5 });
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nums.forEach(n => io.observe(n));
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})();
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/* ================= 进度条 + 回顶部 ================= */
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(function () {
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const bar = document.getElementById('progress');
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const top = document.getElementById('top');
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function onScroll() {
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const st = window.scrollY || document.documentElement.scrollTop;
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const max = document.documentElement.scrollHeight - window.innerHeight;
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bar.style.width = (max > 0 ? (st / max) * 100 : 0) + '%';
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top.classList.toggle('show', st > 500);
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}
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window.addEventListener('scroll', onScroll, { passive: true });
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onScroll();
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top.addEventListener('click', () => window.scrollTo({ top: 0, behavior: 'smooth' }));
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})();
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/* ================= 留言墙 ================= */
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(function () {
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const API = '/api/messages';
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const list = document.getElementById('msgList');
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const nameI = document.getElementById('msgName');
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const textI = document.getElementById('msgText');
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const btn = document.getElementById('msgSend');
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let sending = false;
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const BTN_TEXT = '留 言';
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// 跟随页面渲染出的占位符（班级名由 src/site.config.ts 注入），避免在此硬编码
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const PLACEHOLDER = textI.placeholder || '想说点什么……';
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function setTip(tip) {
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list.innerHTML = '';
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const p = document.createElement('p');
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p.style.cssText = 'color:#66708a;font-size:14px;';
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p.textContent = tip;
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list.appendChild(p);
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}
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function render(data) {
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list.innerHTML = '';
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if (!data || !data.length) {
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setTip('还没有留言，来做第一个吧～');
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return;
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}
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data.forEach((m, i) => {
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const d = document.createElement('div');
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d.className = 'msg';
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d.style.animationDelay = Math.min(i * 0.05, 0.4) + 's';
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const who = document.createElement('div');
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who.className = 'who';
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const span = document.createElement('span');
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span.textContent = m.name;
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const time = document.createElement('time');
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time.textContent = m.time;
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who.append(span, time);
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const body = document.createElement('div');
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body.className = 'body';
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body.textContent = m.text;
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d.append(who, body);
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list.appendChild(d);
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});
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}
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async function load() {
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setTip('加载中…');
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try {
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const res = await fetch(API, { headers: { Accept: 'application/json' } });
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const data = await res.json().catch(() => ({}));
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if (!res.ok || !data.ok) throw new Error(data.error || '加载失败');
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render(data.data);
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} catch (err) {
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setTip('留言加载失败，请刷新重试～');
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}
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}
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async function send() {
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if (sending) return;
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const name = nameI.value.trim();
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const text = textI.value.trim();
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if (!text) {
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textI.focus();
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textI.placeholder = '至少写一句话呀～';
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setTimeout(() => { textI.placeholder = PLACEHOLDER; }, 2000);
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return;
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}
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sending = true;
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btn.disabled = true;
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btn.textContent = '发送中…';
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try {
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const res = await fetch(API, {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify({ name, text })
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});
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const data = await res.json().catch(() => ({}));
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if (!res.ok || !data.ok) throw new Error(data.error || '发送失败');
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textI.value = '';
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btn.textContent = BTN_TEXT;
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btn.disabled = false;
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sending = false;
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// 直接把新留言插到最前面，不用重新拉全量
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if (data.data) {
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const first = list.querySelector('.msg');
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const d = document.createElement('div');
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d.className = 'msg';
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d.style.animationDelay = '0s';
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const who = document.createElement('div');
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who.className = 'who';
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const span = document.createElement('span');
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span.textContent = data.data.name;
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const time = document.createElement('time');
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time.textContent = data.data.time;
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who.append(span, time);
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const body = document.createElement('div');
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body.className = 'body';
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body.textContent = data.data.text;
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d.append(who, body);
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if (first && first.parentNode === list) list.insertBefore(d, first);
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else {
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if (list.querySelector('p')) list.innerHTML = '';
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list.appendChild(d);
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}
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}
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return;
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} catch (err) {
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btn.textContent = err.message && err.message.length <= 10 ? err.message : '发送失败';
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setTimeout(() => {
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btn.textContent = BTN_TEXT;
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btn.disabled = false;
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}, 1600);
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sending = false;
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return;
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}
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}
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btn.addEventListener('click', send);
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textI.addEventListener('keydown', e => {
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if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') btn.click();
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});
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load();
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})(); |