1 页上有多个 JavaScript 计时器

multiple javascript timers on 1 page

本文关键字：JavaScript 计时器      更新时间：2023-09-26

我希望你们能帮助我，因为我对javascript知之甚少。我一直在一遍又一遍地使用相同的计时器，它总是像一个魅力。尽管当我尝试在我的页面下方再次添加相同的计时器时，只有 1 个有效。

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 * 10.1,
        display = document.querySelector('.time');
    startTimer(fiveMinutes, display);
};
<span class="time">10:07</span>
<br/>
<br/>
<br/>
<span class="time">10:07</span>

我已经尝试为不同的类添加第二个脚本，但不幸的是没有工作结果......

有人能帮我吗？JSfiddle更喜欢，因为我对javascript知之甚少！提前感谢！

function startTimer(duration, display, display2) {
    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;
        display2.textContent = display.textContent;
        if (--timer < 0) {
            timer = duration;
        }
    }, 1000);
}


 window.onload = function () {
    var fiveMinutes = 60 * 10.1,
        display = document.querySelector('.time');
        display2 = document.querySelector('.time2');
    startTimer(fiveMinutes, display ,display2);
};

使用 querySelectorAll 

function startTimer(duration, displays) {
    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;
        Array.prototype.forEach.call(displays, function(display) {
            display.textContent = minutes + ":" + seconds;
        });
        if (--timer < 0) {
            timer = duration;
        }
    }, 1000);
}
window.onload = function () {
    var fiveMinutes = 60 * 10.1,
        displays = document.querySelectorAll('.time');
    startTimer(fiveMinutes, displays);
};
<span class="time">10:07</span>
<br/>
<br/>
<br/>
<span class="time">10:07</span>

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