【JavaScript練習】利用定時器做倒計時效果
阿新 • • 發佈:2021-02-06
【JavaScript練習】利用定時器做倒計時效果
執行結果
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document< /title>
<style>
* {
margin: 0;
padding: 0;
}
div {
margin: 50px 100px;
}
span {
background-color: rgba(0, 0, 0, 0.426);
color: #fff;
padding: 10px;
font-weight: 700;
font-size: 18px;
}
</style>
</head>
<body>
<div>
<span class="time">距離</span>
<span class="day"></span>
<span class="hour"></span>
<span class="minute" ></span>
<span class="second"></span>
</div>
<script>
var time = document.querySelector('.time');
var day = document.querySelector('.day');
var hour = document.querySelector('.hour');
var minute = document.querySelector('.minute');
var second = document.querySelector('.second');
var t = '2021-5-1 18:00';
time.innerHTML += t;
var inputTime = +new Date(t); //使用者輸入時間總毫秒數
countDown();
setInterval(countDown, 1000); //頁面剛開始有一秒鐘空白,所以要先呼叫一次返回時間函式
function countDown() {
var nowTime = +new Date(); //當前時間總毫秒數
// var inputTime = +new Date(time); //使用者輸入時間總毫秒數
var times = (inputTime - nowTime) / 1000; //剩餘時間總秒數
var d = parseInt(times / 60 / 60 / 24);
d = d < 10 ? '0' + d : d;
day.innerHTML = d + '天';
var h = parseInt(times / 60 / 60 % 24);
h = h < 10 ? '0' + h : h;
hour.innerHTML = h + '時';
var m = parseInt(times / 60 % 60);
m = m < 10 ? '0' + m : m;
minute.innerHTML = m + '分';
var s = parseInt(times % 60);
s = s < 10 ? '0' + s : s;
second.innerHTML = s + '秒';
// return d + ':' + h + ':' + m + ':' + s + ':';
}
countDown
</script>
</body>
</html>