我在計時器上的分鐘數不會重置爲零

Question

當我的分鐘達到60時，它會繼續，我如何將其重置爲零或歸零？以下是代碼：

var timeStart = 0; 
var interval; 

window.onload = function() { 

    interval = setInterval(function timeReady() { 
     var timeDisplay = document.getElementById("timeDisplay"); 
     var hour = Math.floor(timeStart/3600); 
     var min = Math.floor(timeStart/60); 
     var sec = timeStart - (min * 60); 
      if (sec < 10) { 
       sec = "0" + sec; 
      } 
     var timeMsg = hour + ":" + min + ":" + sec; 
     timeDisplay.innerHTML = timeMsg; 
      timeStart++;    
    },1000) 


    document.getElementById("submitButton").onclick = function() { 
     clearInterval(interval); 
    }; 

}; 

Answer 1

發生這種情況是因爲您計算的分鐘數錯誤。我也修復了你的秒計算。試試這個：

interval = setInterval(function timeReady() { 
    var timeDisplay = document.getElementById("timeDisplay"); 
    var hour = Math.floor(timeStart/3600); 
    var min = Math.floor((timeStart % 3600)/60); 
    var sec = timeStart % 60; 
     if (sec < 10) { 
      sec = "0" + sec; 
     } 
    var timeMsg = hour + ":" + min + ":" + sec; 
    timeDisplay.innerHTML = timeMsg; 
     timeStart++;    
},1000)