京东秒杀倒计时
<title>案例實現</title><style>div {margin: 200px;}span {display: inline-block;width: 40px;height: 40px;background-color: #333;font-size: 20px;color: #fff;text-align: center;line-height: 40px;}</style>
</head><body><div><span class="hour"></span><span class="minute"></span><span class="second"></span></div><script>var hour = document.querySelector('.hour');var minute = document.querySelector('.minute');var second = document.querySelector('.second');var inputTime = +new Date('2022-4-20 18:40:00');//2.聲明自定義函數function countDown(){var nowTime = +new Date();var times = (inputTime - nowTime) / 1000;var h = parseInt(times / 60 / 60 % 24);h = h < 10 ?'0' + h : h;hour.innerHTML = h; var m = parseInt(times / 60 % 60);m = m < 10?'0' + m : m;minute.innerHTML = m;var s = parseInt(times %60);s = s < 10?'0' + s : s;second.innerHTML = s;}countDown();//3.開啟鬧鐘定時器setInterval()setInterval(countDown,1000);</script>
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