js 設定時間戳，進行倒計時。比如距離活動結束時間等等
阿新 • • 發佈：2018-11-15
<html>
<head>
<meta charset="UTF-8">
<title>js簡單時分秒倒計時</title>
<script type="text/javascript">
function countTime() {
//獲取當前時間
var date = new Date();
var now = date.getTime();
//設定截止時間
var str="2017/5/17 00:00:00";
var endDate = new Date(str);
var end = endDate.getTime();
//時間差
var leftTime = end-now;
//定義變數 d,h,m,s儲存倒計時的時間
var d,h,m,s;
if (leftTime>=0) {
d = Math.floor(leftTime/1000/60/60/24);
h = Math.floor(leftTime/1000/60/60%24);
m = Math.floor(leftTime/1000/60%60);
s = Math.floor(leftTime/1000%60);
}
//將倒計時賦值到div中
document.getElementById("_d").innerHTML = d+"天";
document.getElementById("_h").innerHTML = h+"時";
document.getElementById("_m").innerHTML = m+"分";
document.getElementById("_s").innerHTML = s+"秒";
//遞迴每秒呼叫countTime方法，顯示動態時間效果
setTimeout(countTime,1000);
}
</script>
</head >
<body onload="countTime()" >
<div>
<span id="_d">00</span>
<span id="_h">00</span>
<span id="_m">00</span>
<span id="_s">00</span>
</div>
</body>
</html>