<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
setInterval(()=>{
let start_time = new Date('2017/3/12 00:00:00').getTime();//開始時間 先把時間轉成默認格式,再轉成時間戳
let now_time = new Date().getTime();//獲取到當前時間,再轉成時間戳
let sec = (start_time - now_time) / 1000;//用開始時間戳減去當前時間戳 在處於 1000
results = '';
if(sec < 0){//判斷是否爲負數
sec= sec * -1;//如果爲負數那就轉成正數
}
results = {'day':sec / 24 / 3600,'hours':sec / 3600 % 24,'minutes':sec / 60 % 60,'seconds':sec % 60};//計算出天、時、分、秒
let seconds = Math.floor(results.seconds),//去掉小數,僅保留整數
minutes = Math.floor(results.minutes),//去掉小數,僅保留整數
hours = Math.floor(results.hours),//去掉小數,僅保留整數
day = Math.floor(results.day)//去掉小數,僅保留整數
document.querySelector('body').innerHTML = `<div>雲服務器已安全運行 <span> ${day}</span>天<span>${hours}</span>小時<span>${minutes}</span>分<span>${seconds}</span>秒</div>`;
},1000);
</script>
</body>
</html>