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document.addEventListener("DOMContentLoaded", function() { // 鎖定該 App 產生的折扣 Class const appElementSelector = '.discounts__discount'; const myBanner = document.querySelector('.promo-banner-wrap'); if (!myBanner) return; // 1. 初次檢查:如果網頁一載入時折扣就已經存在 if (document.querySelector(appElementSelector)) { myBanner.style.setProperty('display', 'block', 'important'); return; } // 2. 動態監聽:當顧客加入購物車、折扣動態跳出來時觸發 const observer = new MutationObserver((mutations, obs) => { const appElement = document.querySelector(appElementSelector); if (appElement) { myBanner.style.setProperty('display', 'block', 'important'); // 注意:這裡先不中斷監聽(不使用 disconnect), // 因為顧客如果把商品拿掉、折扣消失時,我們希望 Banner 也能同步隱藏。 } else { // 如果折扣元素消失了,就把 Banner 再次隱藏 myBanner.style.setProperty('display', 'none', 'important'); } }); // 開始監聽整個頁面的 HTML 變動 observer.observe(document.body, { childList: true, subtree: true }); });