闲来无事,写一个简单的计时器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Elias:计时器</title>
<style>
div.box{
300px;
height: 100px;
margin: 100px auto;
line-height: 50px;
text-align: center;
border: 1px solid red;
}
div.time{
300px;
height: 50px;
}
</style>
</head>
<body>
<div class="box">
<div class="time">
00:00:00
</div>
<form>
<button type="button" id="reset">重新开始</button>
<button type="button" id="stop">暂停</button>
<button type="button" id="continue">继续</button>
</form>
</div>
<script>
var oTime = document.querySelector('.time');
var oReset = document.getElementById('reset');
var oStop = document.querySelector('#stop');
var oContinue = document.querySelector('#continue');
function format(obj) {//简单封装一个格式化时间的函数
if (obj < 10) {
return "0" + obj;
} else {
return obj;
}
}
var ss,s,ms,hs,timer;
oReset.onclick = function () {
ss = s = ms = hs = 0;
timeRun();
oStop.onclick = function () {
clearInterval(timer);
}
oContinue.onclick = function () {
timeRun();
}
}
function timeRun() {
clearInterval(timer);
timer = setInterval(function () {
ss++;
ms = format(Math.floor(ss / 60));
hs = format(Math.floor(ss / 3600));
s = format(ss % 60);
oTime.innerHTML = hs + ":" + ms + ":" + s;
}, 1000)
}
</script>
</body>
</html>