// 傳入需要倒計(jì)時(shí)的秒數(shù)countDown(times) {// 時(shí)間間隔 1秒const interval = 1000;// 計(jì)算時(shí)間，轉(zhuǎn)化為毫秒let ms = times * 1000;let count = 0;const startTime = new Date().getTime();const endTime = startTime + ms;let timeCounter;timeCounter = setTimeout(countDownStart, interval)function countDownStart() {count++const offset = new Date().getTime() - (startTime + count * interval);// 計(jì)算剩余時(shí)間const diff = endTime - new Date().getTime();const h = Math.floor(diff / (60 * 1000 * 60));const hdiff = diff % (60 * 1000 * 60);const m = Math.floor(hdiff / (60 * 1000));const mdiff = hdiff % (60 * 1000);const s = mdiff / (1000);const sCeil = Math.ceil(s);const sFloor = Math.floor(s);let nextTime = interval - offset;if (nextTime < 0) {nextTime = 0}ms = ms - interval;console.log(`誤差：${offset} ms，下一次執(zhí)行：${nextTime} ms 后，離活動(dòng)開始還有：${ms} ms`);console.log('時(shí)：' + h, '分：' + m, '毫秒：' + s, '秒向上取整：' + sCeil)if (ms < 0) {clearTimeout(timeCounter)console.log('此處執(zhí)行自己想要的操作')} else {timeCounter = setTimeout(countDownStart, nextTime)}}}

核心代碼如上，可以更具自己的業(yè)務(wù)邏輯修改

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