功能：自定义视频播放器中的时间戳控件。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>时间戳</title>
<style>
*{
margin: 0;
padding: 0;
}
div{
400px;
height: 400px;
border: 1px dashed #000;
padding-left: 110px;
box-sizing: border-box;
margin: 100px auto;
}
button{
80px;
height: 50px;
margin-left: 10px;
margin-top: 80px;
}
span{
display: inline-block;
font-size: 50px;
margin-left: 30px;
margin-top: 80px;
}
</style>
<script>
window.onload = function () {
let start = document.getElementById("start");
let end = document.getElementById("end");
let timestamp = document.getElementById("text");
let timer = null;
// 用于控制时间戳的时间
let seconds = 0;
let minutes = 0;
start.onclick = function () {
// 禁用开始按钮，启用结束按钮
start.disabled = true;
end.disabled = false;
timer = setInterval(function () {
minutes = seconds / 60;
// 当分钟数为一位数时
if (minutes < 10) {
// 当秒数也为一位数时
if (seconds%60 < 10)
timestamp.innerHTML = `0${Math.floor(minutes).toString()}:0${(seconds%60).toString()}`;
// 当秒数为两位数时
else if (seconds%60 >= 10)
timestamp.innerHTML = `0${Math.floor(minutes).toString()}:${(seconds%60).toString()}`;
}
else if (minutes >= 10) {
// 当秒数也为两位数时
if (seconds%60 < 10)
timestamp.innerHTML = `${Math.floor(minutes).toString()}:0${(seconds%60).toString()}`;
// 当秒数为两位数时
else if (seconds%60 >= 10)
timestamp.innerHTML = `${Math.floor(minutes).toString()}:${(seconds%60).toString()}`;
}
seconds++;
},1000);
};
end.onclick = function () {
// 禁用结束按钮，启用开始按钮
end.disabled = true;
start.disabled = false;
clearInterval(timer);
}
};
</script>
</head>
<body>
<div>
<button id="start">开始</button>
<button id="end">结束</button>
<br>
<span id="text">00:00</span>
</div>
</body>
</html>