Question

我需要在02.00到0.00之间停止计时。但它在-1.59停止或开始减少。在angular typescript我写了上面的代码。我做错了什么：

<html>
  <body>
    <input type="text" name="otp" placeholer="Enter your otp"/>
    <div>Time left = <span id="timer"></span></div>
  </body>
</html>

IN Angular打字稿：

callMyCount(){    
  document.getElementById('timer').innerHTML ="02" + ":" + "00";
  var myTimer=setInterval(startTimer,1000);

  function startTimer() {
    var presentTime = document.getElementById('timer').innerHTML;
    var timeArray = presentTime.split(/[:]+/);
    var m = parseInt(timeArray[0]);
    var s = checkSecond((parseInt(timeArray[1]) - 1));
    if(s==59){m=m-1}
    if(m<0 && s==59){alert("Timeout for otp");
                     clearTimeout(myTimer);}
    document.('timer').innerHTML =  m + ":" + s;
  }

  function checkSecond(sec) {
    if (sec < 10 && sec >= 0) {sec = "0" + sec}; 
    if (sec < 0) {sec = "59"};
    return sec;
  }
}

Answer 1

使用内部setTimeout执行递归调用并仅计数秒数，您可以做得更简单：

let timerOn = true;

function timer(remaining) {
  var m = Math.floor(remaining / 60);
  var s = remaining % 60;
  
  m = m < 10 ? '0' + m : m;
  s = s < 10 ? '0' + s : s;
  document.getElementById('timer').innerHTML = m + ':' + s;
  remaining -= 1;
  
  if(remaining >= 0 && timerOn) {
    setTimeout(function() {
        timer(remaining);
    }, 1000);
    return;
  }

  if(!timerOn) {
    // Do validate stuff here
    return;
  }
  
  // Do timeout stuff here
  alert('Timeout for otp');
}

timer(120);

<input type="text" name="otp" placeholer="Enter your otp"/>
<div>Time left = <span id="timer"></span></div>

timerOn var仅用于以编程方式停止倒计时。如果加载另一页，则无用。

OTP验证2分钟倒计时器

1 个答案: