我正在努力弄清楚Date（）是如何工作的，我在网上找到了这个并希望在UTC时间21:57停止倒计时。它目前在21:00显示消息，直到22:00显示消息。
我尝试添加if(currenthours != 21 && currentminutes >= 57){并且总是打破它并收到消息。我希望它在22:00之前停止3分钟并显示消息。到达22:00后，在21:57重新开始倒数第二天的倒计时。
任何帮助将不胜感激！
var date;
var display = document.getElementById('time');
setInterval(function(){
date = new Date( );
var currenthours = date.getUTCHours();
// alert(currenthours);
var currentminutes = date.getUTCMinutes();
// alert(currentminutes);
var hours;
var minutes;
var secondes;
if (currenthours != 21) {
if (currenthours < 21) {
hours = 20 - currenthours;
} else {
hours = 21 + (24 - currenthours);
}
minutes = 60 - date.getUTCMinutes();
secondes = 60 - date.getUTCSeconds();
display.innerHTML = ('00' + hours).slice(-2) + ' HOURS ' + '<p>' +
('00' + minutes).slice(-2) + ' MINUTES ' + '</p>' +
('00' + secondes).slice(-2) + ' SECONDS';
} else {
display.innerHTML = "IT'S 21:57";
}
},1000);<div id='time'></div>
小提琴 https://jsfiddle.net/5qrs0tcp/1/
这就是我最终的结果：
/*
|================================|
| COUNTDOWN TIMER |
|================================|
*/
// Return the UTC time component of a date in h:mm:ss.sss format
if (!Date.prototype.toISOTime) {
Date.prototype.toISOTime = function() {
return this.getUTCHours() + ':' +
('0' + this.getUTCMinutes()).slice(-2) + ':' +
('0' + this.getUTCSeconds()).slice(-2);
}
}
// Return the difference in time between two dates
// in h:mm:ss.sss format
if (!Date.prototype.timeDiff) {
Date.prototype.timeDiff = function(date2) {
var diff = Math.abs(this - date2);
return timeobj = {
hours : (diff/3.6e6|0), // hours
minutes : ('0' + ((diff%3.6e6)/6e4|0)).slice(-2), // minutes
seconds : ('0' + ((diff%6e4)/1e3|0)).slice(-2) // seconds
}
}
}
function countDown() {
var now = new Date();
var limitHr = 19;
var limitMin = 55;
var limitDate = new Date(+now);
// Set limitDate to next limit time
limitDate.setUTCHours(limitHr, limitMin, 0, 0);
// var msg = ['Currently: ' + now.toISOTime() + '<br>' + 'Limit: ' + limitDate.toISOTime()];
var msg = [];
var diff;
// If outside limitHr:limitMin to (limitHr + 1):00
if (now.getUTCHours() == limitHr && now.getUTCMinutes() >= limitMin) {
msg.push('Countdown stopped');
setTimeout(function(){
msg = ['Wait for it'];
var jsonCounter = {
stats : msg
}
jsonfile.writeFileSync(DailyGamePath, jsonCounter, {spaces: 3});
},5000);
var jsonCounter = {
stats : msg
}
jsonfile.writeFileSync(DailyGamePath, jsonCounter, {spaces: 3});
} else {
if (now > limitDate) limitDate.setDate(limitDate.getDate() + 1);
var jsonCounter = {
hours : now.timeDiff(limitDate).hours,
minutes : now.timeDiff(limitDate).minutes,
seconds : now.timeDiff(limitDate).seconds,
validating : msg
}
jsonfile.writeFileSync(DailyGamePath, jsonCounter, {spaces: 3});
}
}
setInterval(countDown, 1000);
var daily_status;
setTimeout( function(){
setInterval( function() {
jsonfile.readFile(DailyGamePath, (err, obj) => {
daily_status={
hours: obj.hours,
minutes: obj.minutes,
seconds: obj.seconds,
stats: obj.stats,
validating: obj.validating
};
return daily_status;
});
}, 1000);
}, 3000);
setTimeout( function(){
io.sockets.on('connection', (socket) => {
setInterval( function() {
// var GameStatus=DailyGameStatus();
socket.broadcast.emit('stream', {hours:daily_status.hours, minutes:daily_status.minutes, seconds:daily_status.seconds, stats:daily_status.stats, validating:daily_status.validating});
}, 1000);
});
}, 3000);
答案 0 :(得分：1)
日期对象非常简单，它们只是一个时间值和一些方便的方法。
我认为你的逻辑只需要：
<Flags>
Public Enum ShellStateFlags As UInteger
ShowAllObjects = &H1
ShowFilenameExtensions = &H2
ShowCompressedColor = &H8
SortColumns = &H10
ShowSystemFiles = &H20
DoubleClickInWebView = &H80
DesktopHtml = &H200
Win95Classic = &H400
DontPrettyPath = &H800
MapNetDrvBtn = &H1000
ShowInfoTip = &H2000
HideIcons = &H4000
NoConfirmRecycle = &H8000
WebView = &H20000
ShowSuperHiddenFiles = &H40000
ExplorerSeparateProcess = &H80000
NoNetCrawling = &H100000
AutoChecboxkSelection = &H800000
ShowIconsOnly = &H1000000
ShowTypeOverlay = &H2000000
ShowStatusBar = &H4000000
End Enum
倒计时不太有效，因为你的数字是00而不是57，但是否则似乎没有问题。
if (currenthours != 21 && currentminutes < 57) {
// set the out of hours message
} else {
// time is from 21:57 to 21:59 inclusive
}
var date;
var display = document.getElementById('time');
setInterval(function(){
date = new Date( );
var currenthours = date.getUTCHours();
var currentminutes = date.getUTCMinutes();
var hours;
var minutes;
var secondes;
var limitHr = 5; // Change these to required values
var limitMin = 02; // Using 5:12 for convenience
var message = 'Currently: ' + date.toISOString() + '<p>';
// Create new message if outside limitHr:limitMin to limitHr:59 inclusive
if (currenthours != limitHr || currentminutes < limitMin) {
if (currenthours <= limitHr) {
hours = limitHr - currenthours;
} else {
hours = limitHr + (24 - currenthours);
}
minutes = limitMin - date.getUTCMinutes();
minutes += minutes < 0? 60 : 0;
secondes = 60 - date.getUTCSeconds();
message += ('00' + hours).slice(-2) + ' HOURS ' + '<p>' +
('00' + minutes).slice(-2) + ' MINUTES ' + '</p>' +
('00' + secondes).slice(-2) + ' SECONDS';
} else {
message += 'It\'s on or after ' + limitHr + ':' +
('0'+limitMin).slice(-2) + ' GMT';
}
// Display the message
display.innerHTML = message;
},1000);
是的，计时器有问题，但这不是问题的一部分。对于一个计数器，只是在时间差异上工作更简单，所以我为 Date.prototype 添加了一些方法用于ISO时间（与ISO日期一致）和时差，然后使用这些函数
该函数为结束时间构建日期，以便计算可以使用Date方法。
<div id="time"></div>// Return the UTC time component of a date in h:mm:ss.sss format
if (!Date.prototype.toISOTime) {
Date.prototype.toISOTime = function() {
return this.getUTCHours() + ':' +
('0' + this.getUTCMinutes()).slice(-2) + ':' +
('0' + this.getUTCSeconds()).slice(-2) + '.' +
('00' + this.getUTCMilliseconds()).slice(-3) + 'Z';
}
}
// Return the difference in time between two dates
// in h:mm:ss.sss format
if (!Date.prototype.timeDiff) {
Date.prototype.timeDiff = function(date2) {
var diff = Math.abs(this - date2);
var sign = this > date2? '+' : '-';
return sign + (diff/3.6e6|0) + ':' + // hours
('0' + ((diff%3.6e6)/6e4|0)).slice(-2) + ':' + // minutes
('0' + ((diff%6e4)/1e3|0)).slice(-2) + '.' + // seconds
('00' + (diff%1e3)).slice(-3); // milliseconds
}
}
function countDown() {
var now = new Date();
var limitHr = 1;
var limitMin = 10;
var limitDate = new Date(+now);
// Set limitDate to next limit time
limitDate.setUTCHours(limitHr, limitMin, 0, 0);
var msg = ['Currently: ' + now.toISOTime() + '<br>' + 'Limit: ' + limitDate.toISOTime()];
var diff;
// If outside limitHr:limitMin to (limitHr + 1):00
if (now.getUTCHours() != limitHr || now.getUTCMinutes() != limitMin) {
if (now > limitDate) limitDate.setDate(limitDate.getDate() + 1);
msg.push(now.timeDiff(limitDate));
} else {
msg.push('It\'s after ' + limitHr + ':' + ('0'+limitMin).slice(-2));
}
document.getElementById('msgDiv2').innerHTML = msg.join('<br>');
}
window.onload = function() {
setInterval(countDown, 1000);
}
如果你愿意的话，我已经把毫秒留了几秒钟。
我已经使用setInterval离开了计时器，虽然我更喜欢使用 setTimeout 并手动计算下一整秒之后的时间，以便它永远不会跳过。大多数使用 setTimeout 的浏览器会慢慢漂移，以便它们偶尔会跳过一秒钟。除非您碰巧看到它，或将其与系统时钟的滴答作比较，否则不是真正的问题。