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| <!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>倒计时抢购</title>
</head>
<body>
<div id="box"></div>
<script>
~function(){
let box = document.getElementById('box'),
serverTime = null,
autoTimer = null;
let formatTime = (value) => {
value < 10 ? value = `0${value}` : null;
return value
};
let fn = () => {
serverTime += 1000;
let startTime = new Date('2019/6/4 15:31:08').getTime(),
remainTime = startTime - serverTime;
if (remainTime < 0) {
box.innerHTML = '开抢啦！';
clearInterval(autoTimer);
} else {
let hours = Math.floor(remainTime / (1000 * 60 * 60));
remainTime -= hours * 1000 * 60 * 60;
let minute = Math.floor(remainTime / (1000 * 60));
remainTime -= minute * 1000 * 60;
let second = Math.floor(remainTime / 1000);
hours = formatTime(hours);
minute = formatTime(minute);
second = formatTime(second);
box.innerHTML = `距离抢购还有：${hours}:${minute}:${second}`;
}
};
let getServeTime = () => {
let xhr = new XMLHttpRequest();
xhr.onreadystatechange = () => {
if (!/^(2|3)\d{2}$/.test(xhr.status)) return;
if (xhr.readyState === 2) {
serverTime = new Date(xhr.getResponseHeader('date')).getTime();
fn();
autoTimer = setInterval(fn, 1000);
}
};
xhr.open('head', 'data.json', true);
xhr.send();
};
getServeTime();
}();
</script>
</body>
</html>
|