[英]How to make a setInterval() stop using clearInterval() work?
好吧,我正在尝试使用setInterval()
来停止使用clearInterval()
,这是代码:
let submitBPMkeeper = document.getElementById("submitBPMkeeper"); function startStopBPMkeeper(sr) { let bpmKeepTrack = document.getElementById("bpmSet"); var test1 = 0; var t = setInterval(bpmKTcounter, 60000 / bpmKeepTrack.value); function bpmKTcounter() { test1 += 1; document.getElementById("testInput").innerHTML = test1; } if (sr == "start") { submitBPMkeeper.innerHTML = "Stop"; } else if (sr == "stop") { submitBPMkeeper.innerHTML = "Start"; clearInterval(t); } } submitBPMkeeper.addEventListener("click", function() { if (submitBPMkeeper.innerHTML == "Start") { startStopBPMkeeper("start"); } else if (submitBPMkeeper.innerHTML == "Stop") { startStopBPMkeeper("stop"); } });
<div id="bpm"> <h2>Tempo Keepper:</h2> <label for="bpmSet">BPM:</label> <input type="number" id="bpmSet" name="bpmSet" style="width:40px;" value="80"> <button id="submitBPMkeeper">Start</button> <p id="baseInput"></p> <p id="testInput"></p> </div>
正如你所看到的,你无法停止计数,我真的很希望当你按下停止键时它停止。
只需在上部范围内定义区间变量即可。
const submitBPMkeeper = document.getElementById("submitBPMkeeper");
const bpmKeepTrack = document.getElementById("bpmSet");
let interval = null;
function toggleBPMKeeper() {
let test1 = 0;
function bpmKTcounter() {
test1 += 1;
document.getElementById("testInput").innerHTML = test1;
}
if (interval) {
clearInterval(interval);
interval = null;
submitBPMkeeper.innerHTML = "Start";
} else {
interval = setInterval(bpmKTcounter, 60000 / bpmKeepTrack.value)
submitBPMkeeper.innerHTML = "Stop";
}
}
submitBPMkeeper.onclick = toggleBPMKeeper;
感谢Teemu 的评论,我已经解决了我的问题:
let submitBPMkeeper = document.getElementById("submitBPMkeeper"); var t; function startStopBPMkeeper(sr) { let bpmKeepTrack = document.getElementById("bpmSet"); var test1 = 0; function bpmKTcounter() { test1 += 1; document.getElementById("testInput").innerHTML = test1; } if (sr == "start") { submitBPMkeeper.innerHTML = "Stop"; t = setInterval(bpmKTcounter, 60000 / bpmKeepTrack.value); } else if (sr == "stop") { submitBPMkeeper.innerHTML = "Start"; clearInterval(t); } } submitBPMkeeper.addEventListener("click", function() { if (submitBPMkeeper.innerHTML == "Start") { startStopBPMkeeper("start"); } else if (submitBPMkeeper.innerHTML == "Stop") { startStopBPMkeeper("stop"); } });
<div id="bpm"> <h2>Tempo Keepper:</h2> <label for="bpmSet">BPM:</label> <input type="number" id="bpmSet" name="bpmSet" style="width:40px;" value="80"> <button id="submitBPMkeeper">Start</button> <p id="baseInput"></p> <p id="testInput"></p> </div>
通过在将按钮文本设置为“停止”的同一个 if 块中创建间隔,并将t
声明拉到函数之外,我已经修复了它以使其正常工作。
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