我有一个请求，要求它看起来与我在这里找到的大多数答案略有不同。我正在寻找一个 Javascript 倒计时时钟，它根据服务器的时钟在每周六上午 11 点重复，但服务器位于 CA，并且时钟需要为 EST。我分叉了另一个时钟作为开始，但是当涉及到创建每周计划而不是硬编码日期时，我迷失了方向。任何帮助将不胜感激。谢谢。
http://codepen.io/anon/pen/WrVXNE http://codepen.io/anon/pen/WrVXNE
function getTimeRemaining(endtime) {
var t = Date.parse(endtime) - Date.parse(new Date());
var seconds = Math.floor((t / 1000) % 60);
var minutes = Math.floor((t / 1000 / 60) % 60);
var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
var days = Math.floor(t / (1000 * 60 * 60 * 24));
return {
'total': t,
'days': days,
'hours': hours,
'minutes': minutes,
'seconds': seconds
};
}
function initializeClock(id, endtime) {
var clock = document.getElementById(id);
var daysSpan = clock.querySelector('.days');
var hoursSpan = clock.querySelector('.hours');
var minutesSpan = clock.querySelector('.minutes');
var secondsSpan = clock.querySelector('.seconds');
function updateClock() {
var t = getTimeRemaining(endtime);
daysSpan.innerHTML = t.days;
hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);
if (t.total <= 0) {
clearInterval(timeinterval);
}
}
updateClock();
var timeinterval = setInterval(updateClock, 1000);
}
var deadline = new Date(Date.parse(new Date()) + 15 * 24 * 60 * 60 * 1000);
initializeClock('clockdiv', deadline);
body{
text-align: center;
background: #00ECB9;
font-family: sans-serif;
font-weight: 100;
}
h1{
color: #396;
font-weight: 100;
font-size: 40px;
margin: 40px 0px 20px;
}
#clockdiv{
font-family: sans-serif;
color: #fff;
display: inline-block;
font-weight: 100;
text-align: center;
font-size: 30px;
}
#clockdiv > div{
padding: 10px;
border-radius: 3px;
background: #00BF96;
display: inline-block;
}
#clockdiv div > span{
padding: 15px;
border-radius: 3px;
background: #00816A;
display: inline-block;
}
.smalltext{
padding-top: 5px;
font-size: 16px;
}
<h1>Countdown Clock</h1>
<div id="clockdiv">
<div>
<span class="days"></span>
<div class="smalltext">Days</div>
</div>
<div>
<span class="hours"></span>
<div class="smalltext">Hours</div>
</div>
<div>
<span class="minutes"></span>
<div class="smalltext">Minutes</div>
</div>
<div>
<span class="seconds"></span>
<div class="smalltext">Seconds</div>
</div>
</div>
您可以使用它来获取下周六上午 11 点的日期：
function getNextSaturday() {
var now = new Date();
var nextSaturday = new Date();
nextSaturday.setDate(now.getDate() + (6 - 1 - now.getDay() + 7) % 7 + 1);
nextSaturday.setHours(11, 0, 0, 0);
return nextSaturday;
}
将其转换为 EST 时区：
function convertToEST(date){
estOffset = -4.0 // -5 + 1 daylight savings
utc = date.getTime() + (date.getTimezoneOffset() * 60000);
return new Date(utc + (3600000 * estOffset));
}
总而言之：
function getTimeRemaining(endtime) {
var t = Date.parse(endtime) - Date.parse(new Date());
var seconds = Math.floor((t / 1000) % 60);
var minutes = Math.floor((t / 1000 / 60) % 60);
var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
var days = Math.floor(t / (1000 * 60 * 60 * 24));
return {
'total': t,
'days': days,
'hours': hours,
'minutes': minutes,
'seconds': seconds
};
}
function initializeClock(id, endtime) {
var clock = document.getElementById(id);
var daysSpan = clock.querySelector('.days');
var hoursSpan = clock.querySelector('.hours');
var minutesSpan = clock.querySelector('.minutes');
var secondsSpan = clock.querySelector('.seconds');
function updateClock() {
var t = getTimeRemaining(endtime);
daysSpan.innerHTML = t.days;
hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);
if (t.total <= 0) {
clearInterval(timeinterval);
}
}
updateClock();
var timeinterval = setInterval(updateClock, 1000);
}
function getNextSaturday() {
var now = new Date();
var nextSaturday = new Date();
nextSaturday.setDate(now.getDate() + (6 - 1 - now.getDay() + 7) % 7 + 1);
nextSaturday.setHours(11, 0, 0, 0);
return nextSaturday;
}
function convertToEST(date){
estOffset = -5.0
utc = date.getTime() + (date.getTimezoneOffset() * 60000);
return new Date(utc + (3600000 * estOffset));
}
var deadline = getNextSaturday();
initializeClock('clockdiv', convertToEST(deadline));
body{
text-align: center;
background: #00ECB9;
font-family: sans-serif;
font-weight: 100;
}
h1{
color: #396;
font-weight: 100;
font-size: 40px;
margin: 40px 0px 20px;
}
#clockdiv{
font-family: sans-serif;
color: #fff;
display: inline-block;
font-weight: 100;
text-align: center;
font-size: 30px;
}
#clockdiv > div{
padding: 10px;
border-radius: 3px;
background: #00BF96;
display: inline-block;
}
#clockdiv div > span{
padding: 15px;
border-radius: 3px;
background: #00816A;
display: inline-block;
}
.smalltext{
padding-top: 5px;
font-size: 16px;
}
<h1>Countdown Clock</h1>
<div id="clockdiv">
<div>
<span class="days"></span>
<div class="smalltext">Days</div>
</div>
<div>
<span class="hours"></span>
<div class="smalltext">Hours</div>
</div>
<div>
<span class="minutes"></span>
<div class="smalltext">Minutes</div>
</div>
<div>
<span class="seconds"></span>
<div class="smalltext">Seconds</div>
</div>
</div>
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