如何在进行倒计时时停止 jquery 事件

Question

我几乎不了解 jquery。我正在尝试倒计时，所以在搜索后我找到了下面的代码。

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);
    
}
$('.start').on('click', function(){
    var oneMinute = 60 * 1,
        display = document.querySelector('#time');
        startTimer(oneMinute, display);
})

但是倒计时在一分钟后重复。就像它去 03、02、01 时一样，它又从 59 开始。

如何停止？

我想在给定的分钟后提醒消息并停止计时器。

Answer 1

您需要存储间隔ID并使用clearInterval(intervalId);停止它。

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    var intervalId = 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(intervalId);
        }
    }, 1000);
    
}

$('.start').on('click', function(){
    var oneMinute = 60 * 1,
        display = document.querySelector('#time');
        startTimer(oneMinute, display);
})

Answer 2

setInterval函数returns一个标识符。将间隔 ID 存储在变量中。这允许您在需要时使用 clearInterval() 取消间隔。

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    var interval = 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(interval);
        }
        
    }, 1000);
    
}
$('.start').on('click', function(){
    var oneMinute = 5 * 1, // 5 Seconds for easy testing
        display = document.querySelector('#time');
        startTimer(oneMinute, display);
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div id="time">
00:00
</div>

<button type="button" class="start">
START
</button>

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