JavaScript實作一定時長下點擊次數
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div >
倒計時：<span>60</span>
</div>
<div >
點擊次數：<span>0</span>
</div>
<button >點擊</button>
<button >重置</button>
<script>
var timer = null,//計時器id
duration = 60,//倒計時時長
frequency = 0;//點擊次數
var time = document.querySelector(".time span");
var clickNum = document.querySelector(".clickNum span");
var btnClick = document.querySelector(".btnClick");
var btnReset = document.querySelector(".btnReset");
btnClick.onclick = function () {
if (frequency === 0) { //第一次點擊開始計時
startTime();
}
if(duration === 0){//倒計時為0
return;
}
frequency++;
clickNum.innerText = frequency;//記錄點擊次數
}
btnReset.onclick = function(){
duration = 60;
frequency = 0;
clickNum.innerText = frequency;//點擊次數重置為0
time.innerText = duration;//倒計時長重置為60;
clearInterval(timer);//清除計時器
timer = null;
}
//開始計時
function startTime() {
if (timer) { //計時器有值，回傳
return;
}
timer = setInterval(function () {
duration--;
time.innerText = duration;
if(duration === 0){
clearInterval(timer);
timer = null;
}
}, 30);
}
</script>
</body>
</html>
index.html
效果展示：
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標籤：JavaScript