17 lines
459 B
JavaScript
17 lines
459 B
JavaScript
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function startTimer(duration, display) {
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var timer = duration, minutes, seconds;
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setInterval(function () {
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minutes = parseInt(timer / 60, 10)
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seconds = parseInt(timer % 60, 10);
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minutes = minutes < 10 ? "0" + minutes : minutes;
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seconds = seconds < 10 ? "0" + seconds : seconds;
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display.textContent = minutes + ":" + seconds;
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if (--timer < 0) {
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timer = duration;
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}
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}, 1000);
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}
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