从0数到15的计数器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>2024 IT铁人赛 Day14 -计时器 setInterval()、clearInterval</title>
</head>
<body>
<h1 class="time"></h1>
<script>
const time = document.querySelector(".time");
let idx = 0;
time.innerHTML = idx;
const timer = setInterval(() => {
idx++;
time.innerHTML = idx;
if (idx >= 15) { // 条件大于等于15
clearInterval(timer); // 关闭计时器
}
}, 1000);
</script>
</body>
</html>