倒计时格式显示时间变量超过23小时

Question

我在倒计时的时候出了问题，它显示的时间比"23“还多。知道怎么修吗？

String.prototype.toHHMMSS = function() {
    var sec_num = parseInt(this, 10);
    var days = Math.floor(sec_num / 86400);
    var hours = Math.floor(sec_num / 3600);
    var minutes = Math.floor((sec_num - (hours * 3600)) / 60);
    var seconds = sec_num - (hours * 3600) - (minutes * 60);
    

    return days + " days" + " : " + hours + " hrs" + " : " + minutes + " min" + " : " + seconds + " sec";
  };
  
  
  let startTime = 1649303300; // database unix-timestamp value
  setInterval(() => {
    let curTime = (new Date()).getTime() / 1000;
    curTime = parseInt(curTime);
  

    if (curTime < startTime){
        document.getElementById("timer1").innerText = ("LAUNCHING IN:");
        document.getElementById("timer").innerText = (`${startTime-curTime}`).toHHMMSS();
        
    }
    else {
        document.getElementById("timer1").innerText = ("LAUNCHED");
        document.getElementById("timer").innerText = ("");
    }
    
    
  }, 1000);

“

我的“小时”变量超过了"23“，而不是每24小时增加一天。

Answer 1

您不会以为minutes和seconds所做的方式从minutes变量中减去天数。尝试像这样声明您的小时数变量：

var days = Math.floor(sec_num / 86400);
var hours = Math.floor((sec_num - (days * 86400)) / 3600);

您还可以使用模块化算法来去除多余的值。您可以使用模块化运算符。

String.prototype.toHHMMSS = function() {
    var sec_num = parseInt(this, 10);
    var days = Math.floor(sec_num / 86400);
    var hours = Math.floor(sec_num / 3600) % 24;
    var minutes = Math.floor(sec_num / 60) % 60;
    var seconds = sec_num % 60;
    

    return days + " days" + " : " + hours + " hrs" + " : " + minutes + " min" + " : " + seconds + " sec";
  };