时间戳倒计时为负

Question

我有一个倒数时间戳的脚本。它运行良好，但问题的持续时间少于0。我希望它停止以零。

// $nowtime is a date in future
var startLive = new Date("<?php echo $nowtime; ?>");
var timestamp = startLive - Date.now();
timestamp /= 1000; // from ms to seconds
function component(x, v) {
  return Math.floor(x / v);
}
var $div = $('.time');
timer = setInterval(function() {
  timestamp--;
  var days = component(timestamp, 24 * 60 * 60),
    hours = component(timestamp, 60 * 60) % 24,
    minutes = component(timestamp, 60) % 60,
    seconds = component(timestamp, 1) % 60;
  $div.html(days + " days, " + hours + ":" + minutes + ":" + seconds);
}, 1000);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

输出看起来像1天，6:10:30

问题是，如果它小于零，则仍然为负。像 -3天，-3：-5：-5

如何停在0。

谢谢。

Answer 1

timer = setInterval(function() {
    /* if timestamp <= 0 return means skip rest of function */
    if(timestamp <= 0) {
        clearInterval(timer); 
        return;
    }
    timestamp--;
    var days    = component(timestamp, 24 * 60 * 60),
        hours   = component(timestamp,      60 * 60) % 24,
        minutes = component(timestamp,           60) % 60,
        seconds = component(timestamp,            1) % 60;
    $div.html(days + " days, " + hours + ":" + minutes + ":" + seconds);

}, 1000);

Answer 2

if(timestamp <= 0)
{
clearInterval(timer); 
}