jQuery 计时器仅 30 分钟
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Timer for only 30 mins
提问by Rakesh Shetty
I want to set a timer for example my product should be display for only 30 mins when it is added to cart. I tried :-
我想设置一个计时器，例如我的产品在添加到购物车时应该只显示 30 分钟。我试过 ：-
var d = new Date();
var minute = d.getHours()+30;
Also I want to show user how much time is remaining (countdown)
另外我想向用户展示剩余的时间（倒计时）
I know this is wrong. I want to do this using jQuery. I am new to jquery please help me on this
我知道这是错误的。我想使用 jQuery 来做到这一点。我是 jquery 的新手，请帮助我
Thanks in advance.
提前致谢。
回答by wf9a5m75
yeah this somewhat correct but I want to show user how much time is remaining, i.e countdown should start.How to do that
是的，这有点正确，但我想向用户展示剩余的时间，即倒计时应该开始。如何做到这一点
Ok, how about this:
好的，这个怎么样：
var countdown = 30 * 60 * 1000;
var timerId = setInterval(function(){
countdown -= 1000;
var min = Math.floor(countdown / (60 * 1000));
//var sec = Math.floor(countdown - (min * 60 * 1000)); // wrong
var sec = Math.floor((countdown - (min * 60 * 1000)) / 1000); //correct
if (countdown <= 0) {
alert("30 min!");
clearInterval(timerId);
//doSomething();
} else {
$("#countTime").html(min + " : " + sec);
}
}, 1000); //1000ms. = 1sec.
Or I recommend you use these plugins: http://www.tripwiremagazine.com/2012/09/jquery-countdown-scripts.html
或者我建议您使用这些插件：http: //www.tripwiremagazine.com/2012/09/jquery-countdown-scripts.html
回答by Indigenuity
You could take a look at javascript timers here. If you need to time for 30 minutes, try
您可以在此处查看 javascript 计时器。如果您需要计时 30 分钟，请尝试
var timer = window.setInterval(function()
{
//doSomething
}, 1800000);
EDIT
编辑
To keep it from going off again later, use window.clearInterval(timer);
为了防止它以后再次熄灭，请使用 window.clearInterval(timer);
EDIT
编辑
If you want, you could keep track of how much time has passed, rather than have one big timer.
如果您愿意，您可以跟踪已经过去了多少时间，而不是拥有一个大计时器。
var startTime = (new Date()).getTime();
var secondsLeft;
var timer = window.setInterval(function()
{
var now = (new Date()).getTime();
secondsLeft = 1800 - ((now - startTime) / 1000);
//do something here to display secondsLeft
}
回答by wf9a5m75
If you want to do it in Javascript, you can do it like this:
如果你想用 Javascript 来做，你可以这样做：
var waitTime = 30 * 60 * 1000; // = 30min.
setTimeout(function(){
alert("30 min!");
}, waitTime);
And if you want to use jQuery, you can use jQuery Timer plugin. http://jquery.offput.ca/every/
如果你想使用 jQuery，你可以使用 jQuery Timer 插件。 http://jquery.offput.ca/every/
But I think if you use PHP and the system is shopping cart(or something), maybe you should do it using session mechanism of PHP.
但是我认为如果您使用PHP并且系统是购物车（或其他东西），也许您应该使用PHP的会话机制来做。
