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/* ========================================================================== HFSecurity 首页 v7 · 三 banner 轮播脚本 用途：Elementor → 自定义代码 → 位置选「Body - 结束」；整段粘贴，只放一次 依赖：页面上必须存在 id="hero" 的容器与 .slide / .hero-dots / [data-prev] / [data-next] ========================================================================== */ (function(){ function init(){ var hero=document.getElementById('hero'); if(!hero) return; if(hero.dataset.hfInit) return; // 防止 Elementor 编辑器/多次加载时重复绑定 hero.dataset.hfInit='1'; var slides=[].slice.call(hero.querySelectorAll('.slide')); var dots=[].slice.call(hero.querySelectorAll('.hero-dots button')); var idxBox=hero.querySelector('.hero-idx b'); var n=slides.length; if(n<2) return; var cur=0, timer=null, INTERVAL=7000; var reduce=window.matchMedia('(prefers-reduced-motion: reduce)').matches;// 第 2/3 屏的 banner 延迟到 load 之后加载, 避免与首屏 LCP 抢带宽 function ensureBg(i){ var bg=slides[i].querySelector('.s-bg'); if(bg && !bg.style.backgroundImage && bg.dataset.bg){ bg.style.backgroundImage="url('"+bg.dataset.bg+"')"; } }function go(i){ i=(i+n)%n; if(i===cur) return; ensureBg(i); slides[cur].classList.remove('active'); dots[cur].classList.remove('on'); cur=i; slides[cur].classList.add('active'); dots[cur].classList.add('on'); if(idxBox) idxBox.textContent=('0'+(cur+1)).slice(-2); } function start(){ if(reduce) return; stop(); timer=setInterval(function(){ go(cur+1); }, INTERVAL); } function stop(){ if(timer){ clearInterval(timer); timer=null; } }dots.forEach(function(d){ d.addEventListener('click', function(){ go(parseInt(d.dataset.goto,10)); start(); }); }); var prev=hero.querySelector('[data-prev]'), next=hero.querySelector('[data-next]'); if(prev) prev.addEventListener('click', function(){ go(cur-1); start(); }); if(next) next.addEventListener('click', function(){ go(cur+1); start(); });// 悬停暂停 / 离开继续 hero.addEventListener('mouseenter', stop); hero.addEventListener('mouseleave', start); // 切到后台标签页时停止, 省资源 document.addEventListener('visibilitychange', function(){ document.hidden ? stop() : start(); }); // 键盘左右方向键(整页监听, 因为 hero 本身不可聚焦) document.addEventListener('keydown', function(e){ if(e.key==='ArrowLeft'){ go(cur-1); start(); } if(e.key==='ArrowRight'){ go(cur+1); start(); } });// 移动端触摸滑动 var tx=0, ty=0, tracking=false; hero.addEventListener('touchstart', function(e){ if(e.touches.length!==1) return; tx=e.touches[0].clientX; ty=e.touches[0].clientY; tracking=true; stop(); }, {passive:true}); hero.addEventListener('touchend', function(e){ if(!tracking) return; tracking=false; var t=e.changedTouches[0], dx=t.clientX-tx, dy=t.clientY-ty; // 横向位移足够大且明显大于纵向才算滑动, 避免与页面上下滚动冲突 if(Math.abs(dx)>45 && Math.abs(dx)>Math.abs(dy)*1.4){ go(dx<0?cur+1:cur-1); } start(); }, {passive:true});// 首屏渲染完成后, 空闲时预取第 2/3 张, 避免首次切换出现空白 window.addEventListener('load', function(){ var load=function(){ ensureBg(1); ensureBg(2); }; if(window.requestIdleCallback) requestIdleCallback(load,{timeout:2500}); else setTimeout(load,1200); });start(); } if(document.readyState==='loading'){ document.addEventListener('DOMContentLoaded', init); } else { init(); } })();