[英]JS count down timer
I am trying to create a simple JS countdown timer.我正在尝试创建一个简单的 JS 倒数计时器。 The timer-- is not working.
计时器 -- 不工作。
function setTimer() { var x = parseInt(document.getElementById("input").value); var timer = Math.floor(x * 60); var mins = Math.floor(timer / 60); var secs = Math.floor(timer % 60); var text = document.getElementById("output"); text.innerHTML = mins + ": " + secs; timer--; setTimeout('setTimer()', 1000); }
<input type="text" id="input"> <button id="btn" onClick="setTimer()"> Start </button>
The timer is not reducing.计时器没有减少。 Can you please help?
你能帮忙吗?
Your timer
variable is not changing because it is taking the value again from the input.您的
timer
变量没有改变,因为它再次从输入中获取值。 I have simplified your code below我在下面简化了您的代码
<html>
<script>
var timer;
function setTimer() {
var x = parseInt(document.getElementById("input").value);
timer = Math.floor(x * 60);
handleTimer(timer);
}
function handleTimer(timer) {
var mins = Math.floor(timer / 60);
var secs = Math.floor(timer % 60);
document.getElementById("output").value = mins + " : " + secs;
timer--;
setTimeout(function () {
handleTimer(timer);
}, 1000);
}
</script>
<input type="text" id="input" placeholder="input" />
<input type="text" id="output" placeholder="output" />
<button id="btn" onClick="setTimer()">Start</button>
</html>
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