199 lines
7.4 KiB
JavaScript
199 lines
7.4 KiB
JavaScript
// index.js (改进版)
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// 功能：
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// 1. 解决用户列表竖向轮播在无缝跳转时出现的卡顿/闪动问题
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// 2. 为每条拼单信息增加实时倒计时，秒级更新
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document.addEventListener('DOMContentLoaded', function () {
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/* ---------- 顶部横向轮播 ---------- */
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const wrapper = document.querySelector('.swiper-wrapper');
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const slides = [...wrapper.children];
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const pagination = document.querySelector('.swiper-pagination');
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const count = slides.length;
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let current = 0; // 当前索引
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let startX = 0; // 手势起点
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let dragging = false; // 拖动状态
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let timer = null; // 自动轮播计时器
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/* --- 1. 生成分页小圆点 --- */
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for(let i=0;i<count;i++){
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const dot = document.createElement('div');
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dot.className = 'swiper-dot' + (i===0?' active':'');
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dot.addEventListener('click',()=>goTo(i));
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pagination.appendChild(dot);
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}
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const dots = pagination.children;
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/* --- 2. 切换核心 --- */
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function goTo(index){
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current = (index + count) % count; // 防越界
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wrapper.style.transition = 'transform .3s ease';
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wrapper.style.transform = `translateX(-${current*100}%)`;
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[...dots].forEach((d,i)=>d.classList.toggle('active',i===current));
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}
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/* --- 3. 自动轮播 --- */
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function startAuto(){
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timer = setInterval(()=>goTo(current+1),3000);
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}
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function stopAuto(){
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clearInterval(timer);
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}
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startAuto();
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/* --- 4. 手势/鼠标拖动 --- */
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const getX = e => e.touches ? e.touches[0].clientX : e.clientX;
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wrapper.addEventListener('pointerdown',e=>{
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stopAuto();
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dragging = true;
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startX = getX(e);
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wrapper.style.transition = 'none'; // 跟手拖动
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});
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wrapper.addEventListener('pointermove',e=>{
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if(!dragging) return;
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const diff = getX(e) - startX; // 像素位移
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wrapper.style.transform =
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`translateX(calc(${-current*100}% + ${diff}px))`;
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});
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const endSwipe = e=>{
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if(!dragging) return;
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dragging = false;
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const diff = getX(e) - startX;
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const limit = wrapper.offsetWidth * 0.15; // 15% 宽度阈值
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if(diff > limit) goTo(current-1);
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else if(diff < -limit) goTo(current+1);
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else goTo(current); // 回弹
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startAuto();
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};
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wrapper.addEventListener('pointerup', endSwipe);
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wrapper.addEventListener('pointercancel', endSwipe);
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wrapper.addEventListener('pointerleave', endSwipe);
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/* --------- 动态生成“xx人在抢，参与可立即拼成” --------- */
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const leftNum = Math.floor(Math.random() * 101) + 100; // 100 ~ 200 之间的随机整数
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const leftSpan = document.querySelector('.group-left');
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if (leftSpan) leftSpan.textContent = `${leftNum}人在抢，参与可立即拼成`;
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/* ---------- 拼单用户纵向轮播 ---------- */
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const userList = document.getElementById('userList');
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const userItems = userList.querySelectorAll('.user-item');
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const itemHeight = userItems[0].offsetHeight;
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let userIndex = 0;
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const originalCount = userItems.length;
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// 克隆第一条放到末尾，实现无缝衔接
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userList.appendChild(userItems[0].cloneNode(true));
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userList.addEventListener('transitionend', () => {
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if (userIndex >= originalCount) {
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// 闪电跳回首条，关闭过渡以避免闪屏
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userList.style.transition = 'none';
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userList.style.transform = 'translateY(0)';
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userIndex = 0;
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// 强制回流，保证下次 transition 生效
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void userList.offsetWidth;
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}
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});
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function rotateUsers() {
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userIndex++;
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userList.style.transition = 'transform 0.5s ease';
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userList.style.transform = `translateY(${-userIndex * itemHeight}px)`;
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}
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// 每 3 秒滚动一次
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setInterval(rotateUsers, 3000);
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// 页面加载后立即滚动一次，保证视觉一致
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rotateUsers();
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/* ---------- 拼单倒计时 ---------- */
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const countdownEls = document.querySelectorAll('.countdown');
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// 预处理：把初始文本转为秒数
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const countdownData = Array.from(countdownEls).map((el) => ({
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el,
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remain: parseTime(el.textContent.trim()),
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}));
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function parseTime(t) {
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const [h = '00', m = '00', s = '00'] = t.split(':');
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return Number(h) * 3600 + Number(m) * 60 + Number(s);
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}
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function formatTime(sec) {
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const h = String(Math.floor(sec / 3600)).padStart(2, '0');
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const m = String(Math.floor((sec % 3600) / 60)).padStart(2, '0');
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const s = String(sec % 60).padStart(2, '0');
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return `${h}:${m}:${s}`;
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}
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function updateCountdown() {
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countdownData.forEach((c) => {
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if (c.remain > 0) {
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c.remain -= 1;
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c.el.textContent = formatTime(c.remain);
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} else {
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c.el.textContent = '00:00:00';
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// 可选：到点后给整条加灰色样式，并禁用按钮
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const item = c.el.closest('.user-item');
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item?.classList.add('expired');
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item?.querySelector('.buy-btn')?.setAttribute('disabled', 'disabled');
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}
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});
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}
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/* --------- 给每条拼单状态前加 “仅剩 x 人成团” --------- */
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document.querySelectorAll('.user-status').forEach(statusEl=>{
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const x = Math.floor(Math.random()*3)+1; // 1 ~ 3 随机整数
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const span = document.createElement('span');
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span.className = 'left-num';
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span.textContent = `仅剩${x}人成团，`; // 注意带逗号或空格
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statusEl.prepend(span);
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});
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/* ============= 支付 & 登录判断 ============= */
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const modal = document.getElementById('paymentModal');
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const paymentAmount = document.getElementById('paymentAmount');
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const cancelPayment = document.getElementById('cancelPayment');
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const completePayment= document.getElementById('completePayment');
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/* 把 3 类按钮统一选出来 */
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[...document.querySelectorAll('.buy-btn, .btn-single, .btn-group')].forEach(btn=>{
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btn.addEventListener('click',()=>{
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/* 简单读取 cookie 判断是否登录 */
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if(!getCookie('username')){
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window.location.href='login.html'; // 跳转到登录页
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return;
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}
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/* 已登录：弹出支付弹窗 */
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const price = btn.dataset.price || '0';
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paymentAmount.textContent = `支付金额 ￥${price}`;
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modal.style.display='flex';
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});
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});
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/* 取消/完成支付 */
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cancelPayment.addEventListener('click', ()=>modal.style.display='none');
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completePayment.addEventListener('click', ()=>{
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alert('支付成功！');
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modal.style.display='none';
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});
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/* 读取 cookie 工具函数 */
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function getCookie(name){
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return document.cookie.split(';').map(c=>c.trim())
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.find(c=>c.startsWith(name+'='))?.split('=')[1] || null;
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}
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/* 点击遮罩空白关闭弹窗 */
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modal.addEventListener('click', e=>{
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if(e.target===modal) modal.style.display='none';
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});
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// 每秒刷新一次倒计时
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setInterval(updateCountdown, 1000);
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});
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