如果间隔达到 0，则停止计时器

stop timer if interval reach to 0

本文关键字：计时器 如果      更新时间：2023-09-26

如果计时器达到 0，我需要停止计时器。我需要在 00.00 停止倒计时并显示alert(countdown stopped) .now 它再次开始。到达 00.00 后需要停止

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    setInterval(function () {
        minutes = parseInt(timer / 60, 10)
        seconds = parseInt(timer % 60, 10);
        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;
        display.textContent = minutes + ":" + seconds;
        if (--timer < 0) {
            timer = duration;
        }
    }, 1000);
}
window.onload = function () {
    var fiveMinutes = 60 * .05,
        display = document.querySelector('#time');
    startTimer(fiveMinutes, display);
};
<body>
    <div>Registration closes in <span id="time">start</span> minutes!</div>
</body>

请使用 clearInterval，如片段所示。

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    var __timer = setInterval(function () {
        minutes = parseInt(timer / 60, 10)
        seconds = parseInt(timer % 60, 10);
        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;
        display.textContent = minutes + ":" + seconds;
        if (--timer < 0) {
            clearInterval(__timer);
            timer = duration;
        }
    }, 1000);
}
window.onload = function () {
    var fiveMinutes = 60 * .05,
        display = document.querySelector('#time');
    startTimer(fiveMinutes, display);
};
<body>
    <div>Registration closes in <span id="time">start</span> minutes!</div>
</body>

Orr 你可以包装这行代码 

if (--timer < 0) {
        timer = duration;
    }

跟

  if (display.textContent != "0:00") {
            if (--timer < 0) {
                timer = duration;
            }
        }
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