js定時器
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<button type="button" id="cancel">取消定時器</button>
<script>
let time = setInterval(()=>{
console.log('當前時間是：'+timer())
},1000)
function timer(){
let date = new Date();
let hour = date.getHours().toString().padStart(2,"0");
let min = date.getMinutes().toString().padStart(2,"0");
let sec = date.getSeconds().toString().padStart(2,"0");
return `${hour}:${min}:${sec}`
}
document.getElementById('cancel').onclick = function(){
clearInterval(time)
alert('已取消定時器')
}
</script>
</body>
</html>