本文实例为大家分享了JS实现秒表计时器的具体代码，供大家参考，具体内容如下
秒表计时器的实现：
效果图如下：
附代码，已调试运行
<!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 >Document</ title >
< style >
#div1 {
width: 300px;
height: 400px;
background: skyblue;
margin: 100px auto;
text-align: center;
}
#count {
width: 200px;
height: 150px;
line-height: 150px;
margin: auto;
font-size: 40px;
}
#div1 input {
width: 150px;
height: 40px;
background: orange;
font-size: 25px;
margin-top: 20px
}
</ style >
</ head >
< body >
< div id = "div1" >
< div id = "count" >
< span id = "id_H" >00</ span >
< span id = "id_M" >00</ span >
< span id = "id_S" >00</ span >
</ div >
< input id = "start" type = "button" value = "开始" >
< input id = "pause" type = "button" value = "暂停" >
< input id = "stop" type = "button" value = "停止" >
</ div >
< script >
//可以将查找标签节点的操作进行简化 var btn = getElementById('btn')
function $(id) {
return document.getElementById(id)
}
window.onload = function() {
//点击开始建 开始计数
var count = 0
var timer = null //timer变量记录定时器setInterval的返回值
$("start").onclick = function() {
timer = setInterval(function() {
count++;
console.log(count)
// 需要改变页面上时分秒的值
console.log($("id_S"))
$("id_S").innerHTML = showNum(count % 60)
$("id_M").innerHTML = showNum(parseInt(count / 60) % 60)
$("id_H").innerHTML = showNum(parseInt(count / 60 / 60))
}, 1000)
}
$("pause").onclick = function() {
//取消定时器
clearInterval(timer)
}
//停止记数 数据清零 页面展示数据清零
$("stop").onclick = function() {
//取消定时器
$("pause").onclick()
// clearInterval(timer)
//数据清零 总秒数清零
count = 0
//页面展示数据清零
$("id_S").innerHTML = "00"
$("id_M").innerHTML = "00"
$("id_H").innerHTML = "00"
}
//封装一个处理单位数字的函数
function showNum(num) {
if (num < 10 ) {
return '0' + num
}
return num
}
}
</script>
</ body >
</ html >
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/gao000000/article/details/89099975